Wikipedia
In Greek mythology, Macareus was one of the Heliadae, sons of Helios and Rhodos. Macareus and his brothers, Triopas, Actis and Candalus, were jealous of a fifth brother, Tenages's, skill at science, so they killed him and had to escape from Rhodes upon discovery of their crime. (The two Heliadae Ochimus and Cercaphus stayed aside and remained on the island of Rhodes).
Macareus fled to Lesbos, where he became king, and took over many of the neighboring islands. Lesbos, son of Lapithes and grandson of Aeolus, after whom the island came to be named, married Macareus' daughter, Methymna ( eponym of Methymna, a city at Lesbos); alternately, Methymna married Lepetymnus, eponym of a mountain on Lesbos, and had by him two sons, Hicetaon and Hypsipylus, who were slain by Achilles during the sack of the city of Methymna. Among Macareus' other daughters were Mytilene, Agamede, Antissa, and Arisbe, all eponyms of cities at Lesbos. His sons were entrusted by him the leadership of the colonies he founded on the neighbouring islands: Cydrolaus was sent to Samos, Neandrus to Cos, Leucippus to Rhodes (where the colonists mixed with the local population), and an unnamed son to Chios. Yet another son of Macareus, Eresus, gave his name to a town on Lesbos (modern Eresos).
Macareus or Macar was, in Greek mythology, the son of Aeolus, though sources disagree as to which bearer of this name was his father: it could either be Aeolus the lord of the winds, or Aeolus the king of Tyrrhenia. His mother was, at least in the latter case, Amphithea.
Macareus and his sister Canace fell in love with each other and had a child together. Canace was ordered to kill herself and the baby exposed by Aeolus after he had discovered this, and Macareus took his own life.
Macareus, son of Aeolus, is also given as the father of Amphissa or Issa, who was seduced by Apollo in disguise of a shepherd. Ancient sources do not clarify whether she was the child of Macareus by Canace, or a different child by another unknown consort. In Ovid's account the child of Canace apparently doesn't survive.