Lantaka (rentaka in Malay, also known as Kanyon in Tagalog) were a type of bronze swivel gun mounted on merchant vessels travelling the waterways of Malay Archipelago. Its use was greatest in precolonial South East Asia especially in Malaysia, the Philippines, and Indonesia. The guns were used to defend against pirates demanding tribute for the local chief, or potentate.
Although most lantaka weighed under two hundred pounds, and many only a few pounds, the largest ones exceeded a thousand pounds with some weighing over a ton. Many of these guns were mounted on swivels and were known as swivel guns. The smaller ones could be mounted almost anywhere including in the rigging. Medium-sized cannon were frequently used in reinforced sockets on the vessel's rails and were sometimes referred to as rail guns. The heaviest swivel guns were mounted on modified gun carriages to make them more portable.
Typically the earliest cannon with beautiful ornaments from this region are from foundries in Malacca and Pahang, with later models from foundries in the Netherlands and Portugal, next from their respective settlements, and finally from Brunei and other local craftsmen. However, there were also double-barreled variants that were used extensively in the Philippines. In Malaysia, these double-barreled variants are called Meriam Lela (Malay for 'Lela Cannon') and appears to be longer than a typical Lantaka.
The local population was unimpressed with the might and power of the heavily armed trading vessels from the VOC Dutch East India Company and Portugal. De Barros mentions that with the fall of Malacca, Albuquerque captured 3,000 out of 8,000 artillery. Among those, 2,000 were made from brass and the rest from iron. All the artillery is of such excellent workmanship that it could not be excelled, even in Portugal. - Commentarios do grande Afonso de Albuquerque, Lisbon 1576.