It is stated in the "Nihonshoki" (Chronicles of Japan) that those with distinctive merits were selected on December 4 and given the title Shosen or higher, and therefore Hiro probably received the same or higher title as well.
『日本書紀』は12月4日に勲功ある人を選んで冠位を増し、小山位以上をあたえたと記してあるので、広もこれと同じかそれ以上の位を受けたと思われる。