All-rounder Ryan ten Doeschate has stepped down as captain of county champions Essex after four years.
The 39-year-old had been in charge since 2016 and led the team to the title in two of the past three seasons.
Essex must now appoint a new captain for the County Championship and the 50-over One-Day Cup competition.
“If you look where Essex were before he took over and compare it to where they are now, a lot of that rise is down to Ryan,” said head coach Anthony McGrath.
“Now is the right time for someone else to take the reigns and lead the team.”
Simon Harmer will continue as skipper in the T20 Blast after they won the trophy for the first time in 2019, beating Worcestershire in the final.
Ten Doeschate – who led the side to promotion in his first season as captain – will remain with the club as a player after signing a new one-year contract last October.
He made his Essex debut in 2003 and last summer scored almost 1,000 runs in all competitions.
Essex chairman John Faragher said: “During his time as club captain Ryan has shown outstanding leadership and interpersonal skills, both of which have been a major factor in the club’s success over the last four years.”