In Neil Gaiman’s short story The Heart of a Star, from “Sandman: Endless Nights”, Morpheus’ date Killalla of the Glow is hinted to be an ancestor of the guardians of the universe (the blue guys that created the Green Lantern Corps). 
Little continuity error: in some stories Guardians are said to be born on planet Maltus and then moved to Oa, while Killalla is just said to be from Oa.
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In Neil Gaiman’s short story The Heart of a Star, from “Sandman: Endless Nights”, Morpheus’ date Killalla of the Glow is hinted to be an ancestor of the guardians of the universe (the blue guys that created the Green Lantern Corps). 

Little continuity error: in some stories Guardians are said to be born on planet Maltus and then moved to Oa, while Killalla is just said to be from Oa.

Source