Robert Tideman (or Tideman Winchcombe, as some sources have him) was Bishop of Llandaff from 1393 to 1395, although he was not resident there.
Richard G. Davies, "The Attendance of the Episcopate in English Parlaments, 1376-1461," Proceedings of the American Philosophical Society 129, no. 1 (1985): 30-81.
R.G. Davies, "Winchcombe, Tideman [Robert Tydman]," in Oxford Dictionary of National Biography
Richard G. Davies, "Richard II and the Church," in Anthony Goodman and James L. Gillespie, eds., Richard II: The Art of Kingship (Oxford: Clarendon Press, 1999): 93-106.
Joseph Stratford, Gloucestershire Biographical Notes (Gloucester, 1887): 1-2.
Margaret K. Smith