Final answer:
Martin Luther met with Ulrich Zwingli in 1529 in Marburg, but they failed to unite the German and Swiss reformations due to disagreements on the Eucharist.
Step-by-step explanation:
In 1529, Martin Luther met with the Swiss reformer Ulrich Zwingli at the Marburg Colloquy in an attempt to resolve differences between the German and Swiss reformations. The disagreement centered on the Eucharist, with Zwingli rejecting the Catholic belief in transubstantiation and promoting ideas like removing religious imagery and the Bible printed in the vernacular. Despite their efforts, Luther and Zwingli were unable to come to an agreement, leading to a lasting division between their movements.