Research Notes:
The Oxford Dictionary of National Biography states, [1]
Seagrave [Segrave], Sir Stephen of (d. 1241), justice and administrator, was son of Gilbert of Seagrave, who held lands at Seagrave in Leicestershire and in 1166 held Brailes in Warwickshire as a fourth part of a knight's fee, under William, earl of Warwick. Gilbert was an under-sheriff of Warwickshire and Leicestershire during Richard I's reign and acted as a justice itinerant in Lincolnshire and Leicestershire in 1195.
[1] William Hunt, revised by Paul Brand, "Seagrave [Segrave], Sir Stephen of (d. 1241)," Oxford Dictionary of National Biography (Oxford University Press, 2004, online edition), [Oxford_Dictionary_National_Biography], [OxfordDNB(UM)].