Noted events in his life were:
• Background Information. 1417
The family of Tysons was not Saxon, and it did not hold the barony of Alnwick before the conquest. According to Doomsday Book, Malton barony, instead of being in the possecion of Yvo de Vescy, in the right of his wife, as heir of the Tysons, was in the hands of the king himself; and it was not until the early part of the twelfth century, that it becaame the property of the Lord of Alnwick by gift of King Henry I. Tyson indeed was a Norman family. Gislebert, followed William (the Conqueror) from Normandy, along with the Percys, de Vescys, and other adventurers.
Gislebert Tyson seems to have descend from the powerful house of Tesson, lords of a tract of country in the department Du Calvados, known as Le Cinglais, of which Thury-Harcourt is the capital The name is neither Saxon nor Danish, but Norman-Taisson being a soubriquet given to the lords of Cinglais, signifying a badger [Stapleton's Notes to the Plumpton Correspondence, p. 10].
~The History of the Borough, Castle, and Barony of Alnwick, Volume I, p. 35