Wolfe Tone, one of the united Irishmen who most recognise were the founders of Irish republicanism were protestant. He and the United Irishmen believed there was no equality and liberty for all people in Ireland, especially Catholics under the British rule. This all shows that the biggest misconception in Northern Ireland is that "you have to be catholic to be a republican", this is severely untrue.
Wolfe Tone wanted Protestants and Catholics united in Ireland and live in peace. He wrote his aim was "To unite the whole people of Ireland, to abolish the memory of all past dissensions.To unite Protestant, Catholic and Dissenter under the common name of Irishmen in order break the connection with England"