Thomas left the employ of Theobold, Archbishop of Canterbury, in 1154 when he took up the role of Chancellor for the newly crowned King Henry II (on Theobold’s recommendation).
The new role meant he wasn’t much in London over the next eight years – King Henry II spent less than two-and-a-half years in England during that period and Becket’s new role meant he was expected to be with the King.
One London connection during this period came about, however, when King Henry II awarded him the custody of the Tower of London (the role which is now known as Constable of the Tower and was apparently then referred to as Keeper of the Tower).
Interestingly, Becket is just one of four Archbishops of Canterbury who held the post (although he was Archbishop later) but is the only saint to have done so.
During his time as Constable of the Tower, Becket did carry our substantial repairs on the complex (while Chancellor he also oversaw repairs to other buildings including the Palace of Westminster).
There is a further connection between Becket and the Tower – King Edward I, during his rather dramatic renovations and expansion of the fortress, included a chapel dedicated to the martyred St Thomas in the royal quarters. To this day, the tower which fronts the Thames is known as St Thomas’s Tower (the naming of Traitor’s Gate, formerly known as Water Gate, under it occurred much later and had nothing to do with him).