PINE RIDGE, S.D. (AP) – The Oglala Sioux say they are the first tribe in South Dakota to legalize same-sex marriage.

The tribal council last week approved a same-gender marriage ordinance in a 12-3 vote with one abstention. The new marriage ordinance amends marital and domestic law that has not changed on the Pine Ridge reservation since 1935.

Monique “Muffie” Mousseau and Felipa DeLeon grew up on the reservation, but found they could not be married there in 2015. The couple received a license in Pennington County and wed at a group ceremony at Mount Rushmore.

The two women began petitioning for changes in the reservation’s law, resulting in the passage of same-sex marriage.