Aganju is an orisha, one of the divine powers of the Yoruba tradition of West Africa and of the African-diaspora religions that descend from it, associated with volcanoes, the desert, wild and uncultivated land, rivers, and the great strength needed to cross them. In many lineages he is a ferryman, the powerful spirit who carries travellers over the water, and this role captures his essential character: he is the raw, elemental force of the untamed earth, the heat of the volcano, the vastness of the wilderness, the barrier of the flooding river, and the sheer strength required to master and to cross such things. He is thus a spirit of power, of endurance and of the overcoming of obstacles, and he is associated with wealth and with authority.
Aganju's relationship to Shango, the orisha of thunder, lightning and kingship, is close but variously told across the different lineages and communities: in some he is regarded as Shango's brother, in others as his father, and in others as a companion, and the two are often honoured together, the fiery king and the fiery earth.
In the diaspora religions of Cuba (Lucumi or Santeria) and Brazil (Candomble), where the orisha were carried by enslaved Yoruba and preserved and remade, Aganju is honoured among the orisha, and, as with the other spirits, practitioners have drawn correspondences between him and figures of the Catholic calendar. These are living religions, practised with devotion by many people today across West Africa, the Caribbean, Brazil and beyond, and Aganju is honoured within them as the orisha of the volcano and the wilderness, the elemental strength of the untamed earth and the power to carry across what cannot easily be crossed.