In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

Professor X is the founder of Xavier's School for Gifted Youngsters at a location commonly called the X-Mansion, which recruits mutants from around the world. Located in Westchester County, New York, the X-Mansion is the home and training site of the X-Men. The founding five members of the X-Men who appear in The X-Men #1 (September 1963) are Angel (Archangel), Beast, Cyclops, Iceman, and Marvel Girl (Jean Grey); Professor X and Magneto also made their first appearances in The X-Men #1. Since then, dozens of mutants from various countries and diverse backgrounds have held membership as X-Men.
who joined the x-men in x-men #1 from 1963

The Reformation, specifically referred to as the Protestant Reformation, was a schism in Western Christianity initiated by Martin Luther and continued by John Calvin, Huldrych Zwingli, and other early Protestant Reformers in 16th-century Europe. It is usually considered to have started with the publication of the Ninety-five Theses by Martin Luther in 1517 and lasted until the end of the Thirty Years' War with the Peace of Westphalia in 1648.
who were the main leaders of the reformation

Byzantium took on the name of Kōnstantinoupolis ('city of Constantine', Constantinople) after its refoundation under Roman emperor Constantine I, who transferred the capital of the Roman Empire to Byzantium in 330 and designated his new capital officially as Nova Roma (Νέα Ῥώμη)' New Rome'. During this time, the city was also called' Second Rome',' Eastern Rome', and Roma Constantinopolitana. As the city became the sole remaining capital of the Roman Empire after the fall of the West, and its wealth, population, and influence grew, the city also came to have a multitude of nicknames.

what is the difference between byzantium and constantinople