One of the poems, for instance, says that Tristan's love messages were written on chips of wood, which he floated down the little stream which flowed past his sylvan lodge and crossed the garden of the queen.
[Sidenote: Meliadus.] The inevitable villain of the tale is one of Mark's squires, the spy Meliadus, also a very unheroic character, who told the king of Tristan's love for Iseult.

Mark, who all through the story seems strangely indifferent to his beautiful wife, was not aware of the magic draught and its powerful effect, but Meliadus roused him temporarily from his apathy.
[Illustration: ISEULT SIGNALS TRISTAN .-- Pixis.] As the queen had been publicly accused, he compelled her to prove her innocence by undergoing the ordeal of fire, or by taking a public oath that she had shown favor to none but him.

On her way to the place where this ceremony was to take place, Iseult was carried across a stream by Tristan disguised as a beggar, and, at his request, kissed him in reward for this service.
When called upon to take her oath before the judges and assembled court, Iseult could truthfully swear that, with the exception of the beggar whom she had just publicly kissed, no other man than the king could ever boast of having received any special mark of her favor.
Thus made aware of their danger, the lovers again decided to part, and Tristan, deprived for a time of the sight of Iseult, went mad, and performed many extraordinary feats; for mediaeval poets generally drove their heroes into a frenzy when they did not know what else to do with them.

Having recovered, and hoping to forget the fatal passion which had already caused him so much sorrow, Tristan now wandered off to Arthur's court, where he performed many deeds of valor.

Thence he went on to various strange lands, distinguishing himself greatly everywhere, until he received from a poisoned arrow a wound which no doctor could heal.
[Sidenote: Iseult of Brittany.] Afraid to expose himself again to the fascinations of Iseult of Cornwall, Tristan went to Brittany, where another Iseult,--with the White Hands,--equally well skilled in medicine, tenderly nursed him back to health.