December 19, 1582 – 1588

The Cologne War begins when Elector Gebhard Truchsess turns Protestant

On 19 December 1582 the Elector of Cologne, Gebhard Truchsess von Waldburg, announces his conversion and then marries without resigning. Pope and chapter depose him in 1583, and war lasts to 1588, with Bavaria's Ernst winning.