In the Demon Spawn War, Sehanine rose to the rank of Solar. She served under the archangel Corellon. Her area of operations was on the world Kriav. One of her most well-known generals was Lolth.
When Corellon was elevated to godhood, he passed military operations off to his mate Sehanine. She oversaw military operations on Kriav for the remainder of the Demon Spawn War. After this conflict, she too was elevated to godhood and became his wife.
Sehanine is an elven god, and wife of Corellon. She and Corellon are often derisively referred to as the King and Queen Elf. This is because the two work together in ways that the other gods and sometimes The Balance, view as unfair. So when a god plans to go against either of them, they better be very powerful or come with their own ally, because alone they don't stand much of chance of outwitting the King and Queen Elf.