Pilgrimage is a part of Haitian religious culture. In late July, Voudoist pilgrims visit Plaine du Nord near Bwa Caiman, where according to legend the Haitian Revolution began. There, sacrifices are made and pilgrims immerse themselves in the "trou" (mud pits). The pilgrims often mass before the Church of Saint Jacques, with Saint Jacques perceived as being the lwa Ogou. Another pilgrimage site is Saint d'Eau, a mountain associated with the lwa Ezili Danto. Haitian pilgrims commonly wear coloured ropes around their head or waist while undertaking their pilgrimage. The scholars of religion Terry Rey and Karen Richman argued that this may derive from a Kongolese custom, "kanga" ("to tie"), during which sacred objects were ritually bound with rope.