King James I, whos worse struggles were with the parliament over money, died in 1625. His son Charles I took over.
Charles dissolved the parliament three times between 1625 and 1629. In 1629, he dissolved parliament and resolved to rule alone. This forced him to get money from the English people and his popularity decreased by year. This led to the English Civil War.
From 1642 and 1649, supporters and opponents of Charles I fought the English Civil War. Parliament had more support as well as Oliver Cromwell and Charles' forces were gradually worn down. Cromwell and the opponents (Puritans) brought Charles to trial for treason against Parliament and Charles was executed.