After she challenged Athena to a weaving contest, Athena turned her into a spider
[DOC] [TLE] Athena, Arachne and the Weaving Contest - Greek-Gods.Info [PAR] She claimed that she had learned the skill all by herself and that there was no 
one else in the ... Athena was weaving the Parthenon and her contest with god 
Poseidon.