While in office, Eyre started work on
Fort William,
Calcutta in 1696. On 10 November 1698, Eyre signed the document legalizing the British occupation of three small villages that formed the basis of the Fort William settlement; his signature, and not that of his father-in-law
Job Charnock (who died in 1692) appears on the document signed with the original landlords, the
Sabarna Roy Choudhury family. In December 1699, Eyre was appointed president and governor of
Fort William in
Bengal, and Bengal was at the same time constituted a presidency. He was the first governor appointed by the Company to Bengal since
William Hedges (agent and governor) in 1681 and
William Gyfford (president and governor) in December 1683 (after which the title of governor had been temporarily dropped in favour of agent and chief of the bay of Bengal, Bengal having again been subordinated to
Madras). As a merchant, Eyre amassed a fortune of 23,000
Pagodas, which through the ingenuity of
Thomas Pitt he converted into diamonds to take back with him to England in 1702, having first been ensured a sum of £13,800 through a bill of exchange. His will was proved on 23 October 1729. ==Personal life==