Ancient critics writing on the Iliad were particularly interested in three aspects of Nestor's Cup: its size, why it was that only Nestor could lift it, and the doves on its handles.[2] At least as early as the fifth century BC, scholars including Glaucon, Antisthenes, and Stesimbrotos addressed the question of why Nestor was the only one who could lift his cup; the problem continued to be addressed throughout antiquity at least up until the time of Porphyry, who included it in his Homeric Questions.[2]

(http://www.autoadmit.com/thread.php?thread_id=4730589&forum_id=2...id.#41729729)