Wikipedia
Elosha is a fictional character from the re-imagined Battlestar Galactica series.
Elosha is a priestess who follows the religion of the Lords of Kobol. After having a troubled childhood, a young Elosha turned to religion and studied the scriptures inside and out, probably on the colony Gemenon. Later, she joined the Quorum of Twelve for a time and became spiritual advisor for the Colonial government on Caprica. She was aboard the Battlestar Galactica for the decommissioning ceremony just prior to the Cylon sneak attack on the colonies. Later, Elosha was aboard Colonial Heavy 798 along with Education Secretary Laura Roslin, when news of the Cylon attack was given.
Elosha attended Roslin's ceremony when she took the position of President of the Colonies after President Adar and his cabinet were confirmed to have been killed back on Caprica. She later presided over ceremonies aboard Galactica for those killed in the sneak attack and confirmed what the scriptures stated about the lost colony of Earth which Commander Adama said he knew the location of.
Over time, Elosha grew closer to President Roslin, guiding her with religious advice and helping her find meaning to her "visions" and predictions of finding Kobol and leading the way to Earth.
Once Kobol was discovered, Elosha joined Roslin's rogue-fleet of separatists and landed on Kobol to search for the legendary Tomb of Athena. Elosha never completed the journey however, having stepped on a Cylon landmine which killed her instantly.
In the episode " The Hub", Roslin sees a vision of Elosha, who tries to teach Roslin to open herself up and love.