Bishop Trimnell was baptised on 1 May 1663 at Abbots Ripton, and had three brothers: William (Dean of Winchester), Hugh (king's apothecary), and David (Archdeacon of Leicester).

[1] He took orders in the Church of England: he was made deacon on 22 May 1687[3] and ordained priest on 18 December 1687 — both times by Thomas Barlow, Bishop of Lincoln, at Buckden.

[4] By his wife Henrietta Maria (daughter of William Talbot, Bishop of Durham), he had two sons who died in infancy.

She died in 1716, and in 1719 he married Elizabeth (daughter of Sir Edmund Wynne, 2nd Baronet, of Nostell, Yorkshire; and widow of Joseph Taylor of the Temple).

[1] A royal chaplain to Queen Anne from 1701, he became rector of Southmere in 1704, and of St Giles' Church, Norwich in 1705.