Graces : usually three in number, the personification of grace and loveliness. According to Hesiod, their names were Aglaia, Eurphrosyne and Thalia. They possibly originated as vegetation goddesses.
Repair her loss: refers to the phases of the moon, during which the moon dies and is reborn.
Minos : one of the judges of the dead, so appointed because of his just life on earth. He was, in life, King of Crete. The other judges were Rhadamanthus and ∆acus.
Torquatus : a distinguished cognomen (one of the three elements of the Roman name), meaning Ďadorned with a neck chainí.