Frederick was the third son of Sir Thomas Frederick, sometime Governor of Fort St David, and his wife Mary Moncrieff, daughter of William Moncrieff and was born on 21 December 1709.
[3] He undertook a Grand Tour through Italy, Constantinople, the near East and France with his brother John from 1737 to 1739.
[1] Frederick was returned unopposed as Member of Parliament for New Shoreham in the 1741 general election and also in 1747.
[1] Frederick was also appointed Clerk of the Deliveries in 1746 and promoted to Surveyor-General of the Ordnance in 1750.
[4] Frederick married Lucy Boscawen, daughter of the first Viscount Falmouth on 18 August 1746.