In heraldry, the term sea-lion (sometimes called a morse) refers to a legendary creature that has the head and upper body of a lion, but with webbed forelimbs and a fish tail. These occur most frequently as supporters, but also occur as crests and occasionally as charges. Sea-lions are frequently found in "sejant" or "sejant-erect" (sitting upright) attitudes, but may also be found "naiant" (horizontally, as if swimming) or "assurgeant" (issuing from the waves of the sea).
The sea-lion is prominent in the heraldic tradition of the Philippines, where it denotes state power and authority. It features on the coats of arms of the capital, the primatial see, the seal of the navy, the presidential seal, the seals of the Department of Finance, the Department of Education and other various government offices. It can also be found on the medal of the Philippine Legion of Honor.
The heraldic device comes from Manila's colonial arms, where the sea-lion represents the islands as an ultramar (overseas) possession of Spain; the lion is ultimately derived from the arms of Castile and León.
On May 30, 1596, King Philip II of Spain gave the City of Manila its own specific coat of arms: