[3] His grandfather, Henry Frowick, was also a mercer (five times Master), alderman (Bassishaw ward, 1424–57) and twice Lord Mayor of London (1435-6 and 1444–5).
[5][2] An important seat of the Frowyk family was at South Mimms, Hertfordshire, where Sir Thomas's ancestors and others of his kin are represented in a series of tombs and monuments in the parish church of St Giles.
[7] He was admitted to the Inner Temple, where he appears to have shared a chamber with Thomas Marowe (d.1505), Serjeant-at-law, author of the legal treatise, De Pace (On The Peace).
In that year, with others, he formulated an important award between the town and university of Cambridge, adjusting disputes and defining their jurisdictions precisely.
They had a daughter, Frideswide, aged 8 on 2 February 1506,[14] who was the first wife of Sir Thomas Cheyne, Lord Warden of the Cinque Ports.