Cranmer's first contact with a Continental reformer was with Simon Grynaeus, a humanist based in Basel, Switzerland, and a follower of the Swiss reformers, Huldrych Zwingli and Johannes Oecolampadius. In mid-1531, Grynaeus took an extended visit to England to offer himself as an intermediary between the king and the Continental reformers. He struck up a friendship with Cranmer and after his return to Basel, he wrote about Cranmer to the German reformer Martin Bucer in Strasbourg. Grynaeus' early contacts initiated Cranmer's eventual relationship with the Strasbourg and Swiss reformers.