After falling ill, he sent for Isolde in hopes that she would be able to cure him. If she agreed to come, the returning ship's sails would be white, or the sails would be black if she did not agree. Iseult, seeing the white sails, lied to Tristan and told him that the sails were black. He died of grief before Isolde could reach him. Isolde died soon after of a broken heart.