New Zealand batsman Hamish Marshall became the first centurion of the English county cricket season while helping to break a 106-year-old record for Gloucestershire.
Marshall (120no) and Dan Housego (124no) had compiled an unbroken stand of 229 by stumps against Essex in Chelmsford as the visitors reached 3-300.
It was the highest fourth-wicket partnership for Gloucestershire against Essex, surpassing the previous best, scored in 1907.
Marshall, who played 13 Tests for New Zealand, was the first player in the new English season to reach three figures. The 34-year-old raised his 21st first-class ton just two overs before Housego reached 100.