London - Glamorgan's decision to appoint South Africa opener Alviro Petersen as their new captain led former skipper Jamie Dalrymple to quit the troubled Welsh county on Thursday.
The former England off-spinner said he had "no respect" for club chairperson Paul Russell.
His exit, and that of club president Peter Walker, came just a day after cricket manager Matthew Maynard left the Cardiff-based club rather than accept a demotion to coach.
"I have today (Thursday) resigned from Glamorgan county cricket club with immediate effect," Dalrymple said in a statement.
"I've done so because Glamorgan have effectively dismissed me by removing the captaincy from me, recruiting a new post above Matthew Maynard and me, recruiting a new overseas player and captain in Alviro Petersen.
"All of this without consultation or prior notification with me. This has rendered my position at the club untenable.
"The first I knew of any of these fundamental management and cricket decisions was on Monday afternoon when the chairman Paul Russell phoned to inform me of a fait accompli.
"I understand the club's right to remove the captaincy at their discretion and I recognise that the results in one-day cricket are not yet at a level we were happy with."
Dalrymple had one year left on his contract.
Former Glamorgan all-rounder Walker, who played three Tests for England in 1960, said: "Much has already been reported on the proposed changes in the running and structure of the team.
"I have serious concerns about their likely impact. My standing down now will give the Chairman and officers of the club sufficient time to recommend a suitable replacement to the membership.
"Throughout my period in office the loyal fans of Glamorgan CCC overwhelmingly gave me their support.
"They deserve, and will expect the new President to continue to speak and act on their behalf.
"In the 17 years I played for the county, Glamorgan were a club to whom I was totally committed, on and off the field.
"That state of mind remains and I'm proud of my Honorary Life membership for services to the club -- and the game of cricket."
Glamorgan finished fourth in the second division of the County Championship last season but were bottom in their Pro40 qualifying group and second-bottom in their Twenty20 qualifying group.