The Ottoman–Portuguese or the Turco-Portuguese confrontations[1][2][3] refers to a series of different military encounters between the Portuguese Empire and the Ottoman Empire, or between other European powers and the Ottoman Empire in which relevant Portuguese military forces participated. Some of these conflicts were brief, while others lasted for many years. Most of these conflicts took place in the Indian Ocean, in the process of the expansion of the Portuguese Empire, but also in the Red Sea. These conflicts also involved regional powers, after 1538 the Adal Sultanate, with the aid of the Ottoman Empire, fought against the Ethiopian Empire, which was supported by the Portuguese, under the command of Cristóvão da Gama, the son of the famous explorer Vasco da Gama. This war is known as the Ethiopian–Adal war.