The Holy Trinity Priory was a priory of Austin canons (Black Canons) founded around 1108 by Queen Matilda of England, wife of King Henry I near Aldgate in London. The queen received advice and help in the foundation from Anselm of Canterbury, the Archbishop of Canterbury. It was founded with clergy from St Botolph's Priory in Colchester, and the first prior was Norman, who was the queen's confessor. By 1115 the entire soke, or liberty of East Smithfield (including the ward of Portsoken) was given by the Knighten Guilde to the church of Holy Trinity within Aldgate.