what is the equivalent of Lathander from the Dawn War Deities

A player getting his cleric ready for a campaign I am creating has told me he usually plays Forgotten Realms and his usual deity is Lathander, this is not a deity I am familiar with.

Largely I am basing my Pantheon for this campaign on the DawnWar Deities, with some tweaks being made. I am perfectly happy allowing my Cleric to play Lathander, and he is equally happy to worship an equivalent deity in my pantheon.

Who would be the closest equivalent to Lathander from the Dawn War Deities, either to be replaced by Lathander or to replace him as my players Deity?