Constellation:

Character:

The Founder of the Vongola Famiglia and thus it's first boss and the creator of the Zero Point Breakthrough, to whom Tsuna bears a striking resemblance. He started the family 400 years before the start of the story. He retired early and moved to Japan, where he started a family which eventually produced Tsuna, making him Tsuna's great-great-great grandfather.

Source from Wikipeida