To the King's most Excellent Majesty.  
The humble Petition of James Percy, Esq Right Heir-Male unto, and lawfully claiming the Earldom of Northumberland.  
SHOWETHS,  
THAT your Majesty's Petitioner is Lawfully, and Lineally descended of, and from the Body of Henry Percy, fifth Earl of Northumberland, and hath very fully and clearly proved the same, and by such his Descent and Pedigree, He your said Petitioner is really the next Cousin, and immediate right Heir-Male of, and to Josceline Percy, the late, and eleventh Earl of Northumberland Deceased; And thereby lawfully, and rightfully entitled unto, and as such Heir ought to have and enjoy the said Earldom of Northumberland, and the Honours, Manors, and Dignities thereunto belonging; And also to have, and take the Place and Seat of his Ancestors, former Earls of Northumberland, in the Honourable House of Lords, or Peers in Parliament.  
And therefore He your said Petitoner humbly Prays, that Your Majesty will be Graciously Pleased by Your Royal Writ of Summons, to call Him, Your Petitioner, and Loyal Subject, to come, and have, and take the aforesaid Place, and Seat of his said Ancestors, former Earls of Northumberland, in the said Honourable House of Lords or Peers in Parliament.  
And your Majesty's said Petitioner, and Loyal Subject, as in duty bound, shall ever Pray, etc. James Percy.  
This Petition was Presented the eighth Instant, another of the same was presented upon the sixteenth Instant. And the Answer to both, was, That the Petitioner must make his further Application; for the King referred all to the Parliament.   

To the Right Honourable the Lords Spiritual and Temporal, and Commons Assembled in Parliament. 
 The humble Petition of James Percy, Esq Right Heir unto, and lawfully claiming the Earldom of Northumberland.  
SHOWETHS,  
THAT Your Honour's Petitioner is Lawfully and Lineally descended of, and from the Body of Henry Percy, fifth Earl of Northumberland, and hath Lawfully, and very fully and clearly proved the same; And by such his Descent and Pedigree, he Your said Petitioner is really the next Cousin, and immediate right Heir-Male of, and to Josceline Percy, the late and eleventh Earl of Northumberland, Deceased; And thereby lawfully and rightfully entitled unto, and as such Heir-Male aught to have and enjoy the said Earldom of Northumberland, and the Honours, Manors, and Dignities thereunto belonging; And also to have and take the Place and Seat of his Ancestors, former Earls of Northumberland in this Honourable House of Lords or Peers in Parliament.  
Your Petitioner therefore (having so proved his said Descent and Pedigree as aforesaid) Most humbly Prays Your Honours to admit him Your said Petitioner to have and take the aforesaid Place and Seat of his said Ancestors, former Earls of Northumberland, in this Honourable House of Lords or Peers, or else to appoint a Hearing of your Petitioner's Cause concerning his said Descent and Pedigree before your Honours, and to allow his said Pedigree, And thereupon to admit him Your said Petitioner to have and take the said Place and Seat of his said Ancestors, in this Honourable House of Lords or Peers, as aforesaid.  
And he Your Honours said Petioner, as in Duty bound, shall ever Pray, etc. James Percy.   

Henry Percy fifth Earl of Northumberland had Issue, three Sons, (viz.) Henry, Thomas, and Ingelram.  

2. Sir Thomas, 
the second Son was attainted in King Henry the Eighth's Days, who had Issue-Male, Thomas and Henry.   
1. Henry 
the first Son surviving his Father became, and was the sixth Earl of Northumberland, but died without Issue.   
3. Sir Ingelram Percy 
third Son, had Issue, two Sons, viz. Henry, and Robert.   
 
Restitution by King Edward the sixth to Thomas, and restored by Queen Mary, and confirmed by Queen Elizabeth to Sir Henry, which Brothers were both Earls of Northumberland, But Thomas the seventh Earl died, and left no Issue-Male. Henry the eighth Earl had Issue-Male, viz. eight Sons.   
 
 blazon of the Percy family   
Henry Percy, 
eldest Son, had Issue, three Sons, viz. James, william, and Henry, but the two Elder Brothers died without Issue-Male.   
Henry, 
Eldest Son was the ninth Earl of Northumberland, who had Issue-Males, viz. Four Sons, and three of them were Henrys.   
Henry Percy, 
third Son, had issue three Sons, viz. Henry, James, and Henry, but the two Henrys died young.   
Algernoon, 
the eldest Son, was the tenth Earl of Northumberland, who had Issue-Male, one Son, viz. Josceline Percy.   
James Percy, 
second Son, the now Claimant, hath Issue three Sons, viz. Anthony, Henry, and John.   
Josceline 
was the eleventh Earl of Northumberland who had Issue Henry, and he died in the Life-time of his Father, who died beyond Sea, in May 1670. Heirs Males extinct.   
Anthony Percy, 
eldest Son, hath Issue, viz. Henry Percy, who is Grandson to the Claimant.    
James Percy.  
This short Pedigree hath been often proved at the law, as his printed Case makes appear; therefore he humbly presents twelve Books to the Right Honourable House of Peers, and twelve to the Honourable House of Commons, praying for speedy Justice, and the Petitioner shall ever Pray.  
Printed the the 23d. of March, 1688/9. James Percy.