Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

In the 6th century, this kingdom reduced the Yemen to vassals, while three centuries earlier it invaded and conquered the neighboring Meroe kingdom. Renowned for its huge obelisk tombs, it used its port at Adulis to dominate trade on the Red Sea. It saw the minting of coins under its greatest king, Ezana, whose alliance with Byzantium started the kingdom's conversion to Christianity. For 10 points - what was this trading kingdom of northeastern Africa that eventually developed into Ethiopia
History