 The Sandugo began with the arrival of Miguel López de Legazpi in Bohol in 1565 and the establishment of allegiance by Datu Sikatuna to the king of Spain. They made a cut on their left arm with a dagger and poured their blood into a cup filled with wine, which they both drank in honour of their friendship. The inscription at a monument in Tagbilaran City describes the event:
