To kick off this series, I searched for a figure who was born or died on today's date and came across Berchtold Haller. Variations on his first name include Berchthold, Bertold, and Berthold. His dates are c. 1492 - February 25, 1536. Haller was a German-born reformer. During his studies at Pforzheim, he met Philipp Melanchthon. He was also an associate of Huldrych Zwingli, having met him in 1521. With Zwingli, Haller took part in both the Baden and Bern Disputations, ultimately establishing the Reformation in Bern. In 1532, he co-authored the Berner Synodus, which became Bern's church order. For more information on Haller, you can take a look at Mark Gstohl's Reformation history website.
Incidentally, The Writer's Almanac for February 25, 2012 includes an item relevant to our subject matter here at DET. It was on February 25, 1570 that the Roman Catholic Church officially excommunicated Queen Elizabeth I of England. For more information, do visit the link above.
It was also on this date in 1095 that William II of England, also know as William Rufus, called the Council of Rockingham. Anselm had been consecrated as Archbishop of Canterbury in 1093, but he had not yet received the pallium from the pope. Since William had not recognized Urban II as pope, he rejected Anselm's request to receive the pallium from Rome. The council met to discuss this dispute. In the end the bishops sided with William, who sought to depose Anselm, and the nobles sided with Anselm. This left the matter at a stalemate. Anselm would finally receive the pallium in June of 1095, but would have to flee England in 1097 and remain in exile until William's death in 1100.