Qesan Tasikhe was a prince of Carthak and was a member of the imperial house of Tasikhe. He was killed in the summer of 437 HE. He was likely before Ozorne Tasikhe, his cousin, in the line of succession to the Carthaki throne. He was the son of another prince, like Ozorne was, and is one of Emperor Mesaraz Tasikhe's nephews. According to Ozorne in his message, Qesan was a bit of a lady's man.
He never appears in the book, but is mentioned. His importance stems from the loss of another Tasikhe heir, which puts Ozorne closer and closer to the throne.