e424b2
             
Pricing Supplement Dated
  June 25, 2008   Filed pursuant to Rule 424(b)(2)
(To Prospectus dated November 21, 2007, and
  Registration Statement Nos.   333-147181 and
Prospectus Supplement dated November 21, 2007)
      333-147181-01
 
           
      CUSIP: 74254PZD7

(PRINCIPAL FINANCIAL GROUP LOGO)

Principal Life Insurance Company
Secured Medium-Term Notes (that are also Asset-Backed Securities)
Issued Through and Obligations of
Principal Life Income Fundings Trust 39 (the “Trust” and the “Issuing Entity”)

      The description of this pricing supplement of the particular terms of the Secured Medium-Term Notes offered hereby, and the Funding Agreement (specified below) issued by Principal Life Insurance Company (“Principal Life”) to the Trust, the payment obligations of which are fully and unconditionally guaranteed by the Guarantee (specified below) issued by Principal Financial Group, Inc. to the Trust, supplements the description of the general terms and provisions of the notes, the funding agreements and the guarantees set forth in the accompanying prospectus and prospectus supplement, to which reference is hereby made.

1. The Notes


                     
Principal Amount:
  $ 43,000,000     Purchasing Agent(s) Discount:   0.06%    
 
                   
Issue Price:
    100%     Original Issue Date:   July 2, 2008
 
                   
Net Proceeds to the Trust:
  $ 42,974,200     Stated Maturity Date:   December 15, 2010
 
                   

                     
Specified Currency:
  U.S. Dollars
 
                   
Interest Payment Dates:
  March 15, June 15, September 15 and December 15 of each year
 
                   
Initial Interest Payment Date:
  September 15, 2008
 
                   
Regular Record Date:
  15 calendar days prior to the Interest Payment Date
 
                   
Type of Interest Rate:
  o Fixed Rate   x Floating Rate      
 
                   
Fixed Rate Notes:
  o Yes x No.   If, Yes,
 
                   
Interest Rate:
                 
 
                   
Floating Rate Notes:
  x Yes o No.   If, Yes,
 
                   
Regular Floating Rate Notes:
  x Yes   o No.   If, Yes,
Interest Rate:
3-Month LIBOR + .80%            
Interest Rate Basis(es):
  See below            
 
                   
Floating Rate/Fixed Rate Note:
  o Yes   x No.   If, Yes,
Floating Interest Rate:
   
Interest Rate Basis(es):
   
Fixed Interest Rate:
   
Fixed Rate Commencement Date:
   

 


 

                     
Inverse Floating Rate Note:
  o Yes   x No.   If, Yes,
Fixed Interest Rate:
   
Floating Interest Rate:
   
Interest Rate Basis(es):
   
 
                   
             
Initial Interest Rate, if any:
  3-Month LIBOR + ..80% determined on the second business day preceding the Original Issue Date.
 
                   
Initial Interest Reset Date:
  September 15, 2008
 
Interest Rate Basis(es). Check all that apply:
       
 
  o CD Rate   o Commercial Paper Rate    
 
  o CMT Rate   o Eleventh District Cost of Funds Rate    
 
  o Constant Maturity Swap Rate   o Federal Fund Open Rate    
 
  x LIBOR   o Federal Funds Rate    
 
  o EURIBOR   o Treasury Rate    
 
  o Prime Rate   o Other (See Attached)    
 
           
If LIBOR:
  LIBOR Reuters Screen Page: LIBOR01
 
  LIBOR Currency: U.S. Dollars        
 
           
If CMT Rate:
           
Designated Reuters Page:
       
If FEDCMT:
  o Weekly Average   o Monthly Average    
Designated CMT Maturity Index:
       
 
           
Index Maturity:
  3-month        
 
           
Spread (+/-):
  + .80%        
 
           
Spread Multiplier:
  Not Applicable        
 
           
Interest Reset Date(s):
  Each Interest Payment Date        
 
           
Interest Rate Determination Date(s):
  The second business day preceding the Interest Reset Date  
 
           
Maximum Interest Rate, if any:
  Not Applicable        
 
           
Minimum Interest Rate, if any:
  Not Applicable        
             
Calculation Agent:
  Citibank, N.A.    
 
           
Exchange Rate Agent:
  Not Applicable    
 
           
Computation of Interest
         
(not applicable unless different than as specified in the prospectus and prospectus supplement):
Day Count Convention
         
(not applicable unless different than as specified in the prospectus and prospectus supplement):
 
           
Amortizing Note:
  o Yes   x No.   If, Yes,
Amortizing Schedule:
           
Additional/Other Terms:
           
 
           
Discount Note:
  o Yes   x No.   If, Yes,
Total Amount of Discount:
           
Initial Accrual Period of Discount:
           
Additional/Other Terms:
           
 
           
Redemption Provisions:
  o Yes   x No.   If, Yes,
Initial Redemption Date:
           
Initial Redemption Percentage:
           
Annual Redemption Percentage Reduction (if any):
     
Redemption:
  o In whole only and not in part    
  o May be in whole or in part    
Additional Other Terms:
           

2


 

             
 
           
Repayment:
  o Yes   x No.   If, Yes,
Repayment Date(s):
           
Repayment Price:
           
Repayment:
  o In whole only and not in part    
  o May be in whole or in part    
Additional/Other Terms:
           
 
           
Sinking Fund (not applicable unless specified):
 
 
           
Additional Amounts to be Paid for Withholding Tax
(not applicable unless specified):
 
 
           
Securities Exchange Listing:
  o Yes   x No.   If, Yes, Name of Exchange:
 
           
Authorized Denominations:
  $1,000        

Ratings:

The Notes issued under the Program are rated AA by Standard & Poor’s Ratings Services, a division of The McGraw-Hill Companies, Inc. (“S&P”). Principal Life expects the Notes to be rated Aa2 by Moody’s Investors Service, Inc. (“Moody’s).
             
Purchasing Agents Purchasing Notes as Principal:
  x Yes   o No.   If, Yes:
         
Purchasing Agent(s)
  Principal Amount
Barclays Capital Inc.
  $ 43,000,000  
 
 
   
 
 
 
Total:
  $ 43,000,000  
             
Purchasing Agents Purchasing Notes as Principal:
  o Yes   o No.   If, Yes:
         
Purchasing Agent(s)
  Principal Amount
 
                            
 
   
 
 
Total:
                                 
                     
State of Organization of the Trust:
New York                
 
                   
Additional/Other Terms:
 
                   
Special Tax Considerations:
 
                   
2. The Funding Agreement
                 
 
                   
Funding Agreement Issuer:
Principal Life Insurance Company            
 
                   
Funding Agreement No.:
6-15527                
 
                   
Deposit Amount:
  $43,000,015
 
                   
Net Deposit:
$42,974,200
 
                   
Effective Date:
July 2, 2008
 
                   
Stated Maturity Date:
December 15, 2010
 
                   
Specified Currency:
  U.S. Dollars
 
                   
Interest Payment Dates:
  March 15, June 15, September 15 and December 15 of each year
 
                   
Initial Interest Payment Date:
  September 15, 2008
 
                   
Type of Interest Rate:
  o Fixed Rate   x Floating Rate      
 
                   
Fixed Rate Funding Agreement:
  o Yes x No.   If, Yes,

3


 

                     
 
                   
Interest Rate:
   
 
                   
Floating Rate Funding Agreement:
  x Yes o No.   If, Yes,
 
                   
Regular Floating Rate Funding Agreement:
  x Yes   o No.   If Yes,
Interest Rate: 3-Month LIBOR + .80%
                   
Interest Rate Basis(es): See below
   
 
                   
Floating Rate/Fixed Rate Funding Agreement:
  o Yes   x No.   If, Yes,
Floating Interest Rate:
   
Interest Rate Basis(es):
   
Fixed Interest Rate:
       
Fixed Rate Commencement Date:
   
 
                   
Inverse Floating Rate Funding Agreement:
  o Yes   x No.   If, Yes,
Fixed Interest Rate:
   
Floating Interest Rate:
   
Interest Rate Basis(es):
   
 
                   
Initial Interest Rate, if any:
  3-Month LIBOR + ..80% determined on the second business day preceding the Original Issue Date.
 
                   
Initial Interest Reset Date:
  September 15, 2008
             
Interest Rate Basis(es). check all that apply
       
 
  o CD Rate   o Commercial Paper Rate    
 
  o CMT Rate   o Eleventh District Cost of Funds Rate    
 
  x LIBOR   o Federal Funds Open Rate    
 
  o EURIBOR   o Treasury Rate    
 
  o Prime Rate   o Other (See Attached)    
 
           
If LIBOR:
  LIBOR Reuters Screen Page: LIBOR01
 
  LIBOR Currency: U.S. Dollars        
 
           
If CMT Rate:
           
Designated CMT Reuters Page:
       
If FEDCMT:
  o Weekly Average   o Monthly Average    
Designated CMT Maturity Index:
       
             
Index Maturity:
  3-Month
 
           
Spread (+/-):
  + .80%
 
           
Spread Multiplier:
  Not Applicable
 
           
Interest Reset Date(s):
  Each Interest Payment Date
 
           
Interest Rate Determination Date(s):
  The second business day preceding the related Interest Reset Date
 
           
Maximum Interest Rate, if any:
  Not Applicable
 
           
Minimum Interest Rate, if any:
  Not Applicable
 
           
Calculation of Interest (not applicable unless different than as specified in the prospectus and prospectus supplement):
 
Day Count Convention: (not applicable unless different than as specified in the prospectus and prospectus supplement):
 
           
Amortizing Funding Agreement:
  o Yes   x No.   If, Yes


 

             
Amortizing Schedule:
           
Additional/Other Terms:
           
 
           
Discount Funding Agreement:
  o Yes   x No.   If, Yes,
Total Amount of Discount:
           
Initial Accrual Period of Discount:
           
Additional/Other Terms:
           
 
           
Redemption Provisions:
  o Yes   x No.   If, Yes,
Initial Redemption Date:
           
Initial Redemption Percentage:
           
Annual Redemption Percentage Reduction (if any):
           
Redemption:
  o In whole only and not in part    
  o May be in whole or in part    
Additional/Other Terms:
           
 
           
Repayment:
  o Yes   o No.   If, Yes,
Repayment Date(s):
           
Repayment Price:
           
Repayment:
  o In whole only and not in part    
  o May be in whole or in part    
Additional/Other Terms:
           
 
           
Sinking Fund (not applicable unless specified):
 
 
           
Additional Amounts to be Paid For Withholding Tax
(not applicable unless specified):
 

Ratings:

The Funding Agreement issued under the Program is rated AA by S&P.
Principal Life expects the Funding Agreement to be rated Aa2 by Moody’s.
     
Additional/Other Terms if any:
 
 
   
Special Tax Considerations:
 
 
   
3. The Guarantee
   
 
   
Guarantee Issuer:
  Principal Financial Group, Inc.
 
   
Effective Date:
  July 2, 2008
 
   
Additional/Other Terms if any:
   

5