evidence: The divide between Catholics and Protestants in Northern Ireland had little to do with theological differences but instead was grounded in culture and politics. Neither Irish history nor the Irish language was taught in schools in Northern Ireland, it was illegal to fly the flag of the Irish republic, and from 1956 to 1974 Sinn Féin, the party of Irish republicanism, also was banned in Northern Ireland. Catholics by and large identified as Irish and sought the incorporation of Northern Ireland into the Irish state. The great bulk of Protestants saw themselves as British and feared that they would lose their culture and privilege if Northern Ireland were subsumed by the republic. They expressed their partisan solidarity through involvement with Protestant unionist fraternal organizations such as the Orange Order, which found its inspiration in the victory of King William III (William of Orange) at the Battle of the Boyne in 1690 over his deposed Catholic predecessor, James II, whose siege of the Protestant community of Londonderry had earlier been broken by William. Despite these tensions, for 40 or so years after partition the status of unionist-dominated Northern Ireland was relatively stable.