Lucy Lawless plays Diane Lewis, the woman Ron Swanson eventually marries in "Parks and Recreation." Diane is introduced as a middle-school vice principal and single mother whose daughters, Ivy and Zoe, become part of Ron's life.
Diane first meets Ron after he personally fixes a pothole outside her house because the public-works department has ignored her complaints. Their relationship is unusual for Ron: Diane is not one of his ex-wives named Tammy, and she challenges his discomfort around young girls while accepting his eccentric personality.
Lawless was already widely known for playing the title character in "Xena: Warrior Princess." On "Parks and Recreation," her role as Diane gave Ron a serious long-term relationship and helped move his character beyond the recurring Tammy joke. Diane's surname is also sometimes listed as Diane Lewis-Swanson after her marriage, which can make the character harder to identify in cast references.