Rubuta ci gaba ga wannan sakin layi - Matashi ne lokacin da mahaifinsa ya mutu, an sanya shi a karkashin kulawar William Longespée, Earl na Salisbury, har sai ya tsufa. An ba shi daraja a 1229, ya shiga cikin tafiyar Sarki Henry III na Ingila zuwa Brittany da Faransa
a shekara ta 1230. An hana shi halartar gasa a Blyth, Northampton da Cambridge tsakanin 1232 da 1234. Lokacin da aka gayyaci Sarki Alexander III na Scotland don halartar kotun Ingila a 1235 da kuma a 1237, Vesci ya raka Alexander III. William ya shiga cikin tafiyar Sarki Henry III zuwa Gascony a 1242. A shekara ta 1245, ya kasance cikin balaguron Sarki Henry III zuwa Wales. Ya kafa gidan Carmelite na Hulne, Northumberland a lokacin rayuwarsa.