Cocks sailed to Japan on the ship
Clove as part of the first English expedition to the country, led by
John Saris, which left England in 1611 and arrived in Hirado on 12 June 1613. Cocks was appointed chief factor of the East India Company at Hirado on 26 November 1613, shortly before Saris' departure for England. The surviving documents of the trading post (letters, accounts and journals) are a unique source of first-hand accounts of
early modern Japan through secular Western eyes. During his time in Japan, he wrote a very detailed diary, relating the history of the trading post, the situation of Japan at the time, and the activities of English merchants in Japan, among whom was also the English pilot and
samurai,
retainer to
Tokugawa Ieyasu,
William Adams, with whom he wrote he had visited the residence of Imperial Fleet Admiral
Mukai Shogen Tadakatsu, under orders from the
Shogun, to discuss the possibility, required logistics, and outcome of an invasion of the
Spanish Philippines in 1616. Cocks was close to Adams, inheriting many of his prized possessions upon his death in 1620, and later paying financial support for two children claimed to be Adams'. In the spring of 1622, Cocks was ordered to return to Batavia after Richard Fursland, the president of the Council of Defence at the Company, received reports of extravagant feasting and womanizing among the English traders in Hirado. Cocks ignored the order, but thereafter, Fursland sent Joseph Cockram to Hirado in the summer of 1623 to audit the Company's accounts. Cockram discovered a massive deficit in the accounts, which led Fursland to close the factory at Hirado. Cocks and the other English traders departed Japan on the
Bull on Christmas Eve, 1623. ==Death at sea==