Although William's supporters dominated the government, there remained a significant following for James, particularly in the Highlands. His cause, which became known as Jacobitism, from the Latin (Jacobus) for James, led to a series of risings. An initial Jacobite military attempt was led by John Graham, now Viscount Dundee. His forces, almost all Highlanders, defeated William's forces at the Battle of Killiecrankie in 1689, but they took heavy losses and Dundee was slain in the fighting. Without his leadership the Jacobite army was soon defeated at the Battle of Dunkeld. The complete defeat of James in Ireland by William at the Battle of Aughrim (1691), ended the first phase of the Jacobite military effort. In the aftermath of the Jacobite defeat on 13 February 1692 in an incident known as the Massacre of Glencoe, 38 members of the Clan MacDonald of Glencoe were killed by members of the Earl of Argyll's Regiment of Foot, who had accepted their hospitality, on the grounds that they had not been prompt in pledging allegiance to the new monarchs.