The Trinity of 2 brothers and a sister

Balabhadra is the elder brother, Jagannath is the younger and Subhadra is the youngest sister. In hymn 10.155 of the Rig veda, there is mention of a Daru (wooden log) floating in the ocean as apurusham. Acharya Sayana interpreted the term apurusham as same as Purushottama and this Dara wood log being an inspiration for Jagannath, thus placing the origin of Jagannath in 2nd millennium BCE.