King Mark Timeline and Summary

Mark knights Tristan, then allows him to serve as his champion against Morholt.
Mark declares that he will marry the woman whose hair a swallow drops in front of him.
Mark fails to recognize the substitution of Brangain for Yseut on his wedding night. After their marriage, he treats Yseut well.
Mark eavesdrops on Tristan and Yseut's tryst and believes their playacting, becoming convinced that they are not lovers.
Mark goes along with a plot to catch Tristan in Yseut's bed and condemns them to be burnt when they are caught.
Mark accepts Yseut back into his household after he receives a letter from Tristan insisting on her innocence. However, he caves to his barons' demand that he send Tristan away.
Mark witnesses Yseut's oath of fidelity to him and, at Arthur's prompting, agrees never to mistrust her again.
Mark apparently backtracks on this agreement when Tristan kills two of his barons; he announces a reward for Tristan's capture, forcing Tristan to go into exile in Brittany.
After Tristan and Yseut's death, Mark arranges for their burial in a Cornish chapel. He repeatedly attempts to cut down the trees that intertwine over their graves.