Blood compact (Spanish: Pacto de sangre; Tagalog: Sanduguan) was an ancient ritual in the Philippines intended to seal a friendship or treaty, or to validate an agreement.
The contracting parties would cut their hands and pour their blood into a cup filled with liquid, such as wine, and drink the mixture.
An earlier blood compact, the first between natives and Europeans took place in 1521 between navigator Ferdinand Magellan and Rajah Humabon of Cebu.
[1] Another type of blood compact was also described by Antonio Pigafetta during their stopover in Palawan (after the death of Magellan).
Schück eventually settled in Sulu and introduced the Kahawa Sug coffee varietal to the islands.