PORT OF YORK 29 they had high prows'and sterns, with a capacious hold between. Some of them were built in York. Their trade was such that some of the York merchants, for example the wealthy Howme family, had establishments in foreign ports. The Howmes had property in Calais. The regulation of the waterways- in and near the city was vested in the Corporation. Matters per- taining to navigation and shipping were adjudged by an Admiralty Court under the King's Admiral, whose j urisdiction extended from the Thames to the northern ports.