During this historical period the task of the treasurer, in conjunction with the Captain of Calais, was keeping the defences in order, supplying victuals and paying the garrison.
The treasurer was responsible for raising revenue from the Company of the Staple of Calais, which was required to contribute towards the expenses of defence.
[1] The treasurer was a trusty servant of the Crown, which fostered the respect accorded to him by the garrison and officials as well as by those required to pay taxes to him, namely, merchants and burgesses.
The detailed functions of the treasurer remain unknown, but included the general supervision of the royal finances at Calais.
He also was responsible for the letting of certain lands, and was empowered in conjunction with the captain to make appointments to unoccupied posts.