"Savage tribes knew the Pleiades familiarly, as well as did the people of ancient and modern civilization; and Ellis wrote of the natives of the Society and Tonga Islands, who called these stars Matarii, the Little Eyes:

The two seasons of the year were divided by the Pleiades; the first, Matarii i nia, the Pleiades Above, commenced when, in the evening, those stars appeared on the horizon, and continued while, after sunset, they were above. The other season, Matarii i raro, the Pleiades Below, began when, at sunset, they ceased to be visible, and continued till, in the evening, they appeared again above the horizon. 

Gill gives a similar story from the Hervey group, where the Little Eyes are Matariki, and at one time but a single star, so bright that their god Tane in envy got hold of Aumea, our Aldebaran, and, accompanied by Mere, our Sirius, chased the offender, who took refuge in a stream. Mere, however, drained off the water, and Tane hurled Aumea at the fugitive, breaking him into the six pieces that we now see, whence the native name for the fragments, Tauono, the Six, quoted by Flammarion as Tau, both titles singularly like the Latin Taurus. They were the favorite one of the various avelas, or guides at sea in night voyages from one island to another; and, as opening the year, objects of worship down to 1857, when Christianity prevailed throughout these islands." (Allen)

Once Matariki was a single very bright star, who took refuge in a stream (presumably the Milky Way). Its water hid him.

Later there were 6 pieces of him in Tauono, and they defined the two halves of the year.