Aristophanes, Birds 493, with comment from the scholia there.
The wool and weaving of the Phrygians, and of their predecessors the Maeonians, were famous in antiquity. Excavations at Gordion have revealed flatweave textiles similar to modern kilim. The softness of their wool suggests the use of mohair, the spring underdown of Angora- or cashmere-type goats, suitable for the Phrygian terrain and perhaps reflected in their mythology of Dionysus and "Pan". Traditionally the Angora goat was introduced to the Ankara area by the Turks or other Central Asian nomads, but others suggest a much earlier arrival. We must await results from the new field of paleo-zoology.