Fasti Ecclesiae Anglicanae 1066-1300, iii, 5-12:
William de Thornaco was probably related to Stephen de Tornaco, a prebend of Wells, by whom he was presented to the church of Binegar (Somt.). Stephen was the brother of Thomas de Tornaco, prebend and archdeacon of Wells.
William was a bishop's clerk, appearing without his title on 5 October 1213. He was archdeacon of Stow, first occurring on 27 February 1214, following by archdeacon of Lincoln, in which office he appears by 22 May 1219. He became dean of Lincoln between 28 January and 12 March 1223. William was suspended in office by the bishop in 1239, together with the precentor and subdean. He was deprived or resigned office and became a Cistercian monk at Louth Park in 1239/40 and died there on 25 June 1258.