In 1641, rebellious irish catholics were angered by the who had power over their wealth.

The answer is English and Scottish Protestant settlers.  This occurred during the Irish Rebellion of 1641 where many Irish landowners lost their lands to incoming English and Scottish settlers.  They resented how their lands were taken from them that later led to a rebellion.  The causes of the rebellion were lost of lands to the plantations of the new settlers, differences in religion, conspiracy between King Charles I and the Irish and finally poor economic conditions that left many poor in Ireland.  It resulted in the establishment of the Irish Confederation and the start of the Confederate Wars.  Wars continued until it was stopped by Oliver Cromwell’s new Model Army.