The Sandugo was a blood compact, performed in the island of Bohol in the Philippines, between the Spanish explorer Miguel López de Legazpi and Datu Sikatuna the chieftain of Bohol on March 16, 1565, to seal their friendship as part of the tribal tradition. This is considered as the first treaty of friendship between the Spaniards and Filipinos. "Sandugo" is a Visayan word which means "one blood".
The Sandugo is depicted in both the provincial flag and the official seal of the government in Bohol. It also features the image of the blood compact. The top of the seal explains the history behind the Sandugo event that occurred in Bohol, the fleet and the location where the Spaniards anchored and the place where the treaty was conducted which was dated on March 16, 1565.
In 1521, Portuguese explorer Ferdinand Magellan became the first person from Europe to reach Asia by sailing west, a voyage of which he would meet an untimely death in the island of the Philippines. Spain sent expeditions to colonize the East Indies in their competition with Portugal to seize control over the spice trade. However, all of these expeditions failed. It was not until Miguel López de Legazpi, sailing from Mexico with five ships and five hundred men, reached the Philippines in 1565 and a Spanish settlement was established. López de Legazpi was greeted by hostile Muslim tribes opposing a foreign invasion. His attempt to land on the island of Cebu resulted in the death of one of his soldiers prompting him to explore another island and seek trade with various tribes.
Sailing south toward the island of Mindanao, López de Legazpi's fleet encountered highwinds forcing them to sail northward to the island of Bohol. There, he captured a vessel from Borneo whose Malay sailors informed the Spaniards that the natives inhabiting the region traded with people from Borneo and Indonesia. Arriving in Bohol, López de Legazpi noticed the hostility of the people. The Malayan servant explained that such hostility was due to the expeditions conducted by the Portuguese from the Moluccas islands. In 1563, Portuguese fleets arrived in Visayan waters and enslaved about 1,000 inhabitants. López de Legazpi, with the help of the Malayan sailor, explained to the tribes in Bohol that they were not Portuguese and that they had come to the islands to trade. Upon learning this, the chieftains and their tribes became friendlier and welcoming to the Spaniards.