While this figure helped his most famous companion defeat the Solymi and the Amazons, he was also responsible for that companion's death when he was stung by a gadfly sent by Zeus.
When Mount Helicon grew skyward after the Muses defeated the daughters of Pierus in a singing contest, Poseidon beseeched this figure to use his strength to halt its growth. While this figure helped his most famous companion defeat the Solymi and the Amazons, he was also responsible for that companion's death when he was stung by a gadfly sent by Zeus. This figure had an affinity for springs as he created ones at Troezen and Hippocrene and was found by his most notable companion while drinking from one at Pirene. Sometimes considered a son of Poseidon, this brother of Chrysaor was born when Perseus decapitated his mother. After this bearer of Zeus' thunderbolts was tamed by Athena's golden bridle, his companion used this figure's ability to fly to defeat the Chimera. For ten points, identify this winged horse from Greek mythology, who was tamed by Bellorophon.
When Mount Helicon grew skyward after the Muses defeated the daughters of Pierus in a singing contest, Poseidon beseeched this figure to use his strength to halt its growth.
{Pegasus}