In Greek mythology, the Niobids were the children of Amphion of Thebes and Niobe, slain by Apollo and Artemis because Niobe, born of the royal house of Phrygia, had boastfully compared the greater number of her own offspring with those of Leto, Apollo's and Artemis' mother: a classic example of hubris.
Roman fresco: Apollo and Artemis shoot the sons of Niobe, who flee (partly on horseback) in an idyllic landscape, 1st c. BC - 1st c. AD
Roman sarcophagus: Apollo and Artemis killing the 14 children of Niobe (front side). Artemis; 5 daughters with a nurse; younger son with a pedagogue; 3 other sons; Apollo. Top: dead Niobids. 160–170 Ad
Niobid rises on a rock Galleria degli Uffizi
The Niobe Room (Italian: Sala della Niobe) at the Uffizi
There are several characters named Amphion in Greek mythology:
Amphion building Thebes with the power of music, from a 1655 engraving