John Segrave son of I believe Thomas de Segrave of the baron line, and one of the lesser son who never was in line to recieve the title(darn the luck).
John Segrave moved to Limerick Ireland, and married Jennet Dungan in 1500. Jennet was from a family of Earls of limerick Ireland. John and Jennet's children inherited land and title through her.
Sorry this is all I have on them.