Sonia Sotomayor was sworn in Saturday as the Supreme Court’s newest justice.

The 55-year-old is the first Hispanic justice and the third woman in the court’s 220-year history.

Chief Justice John Roberts delivered the second of two oaths of office in a Supreme Court conference room beneath a portrait of the legendary Chief Justice John Marshall, according to The Associated Press.

With her left hand resting on a Bible held by her mother, Celina, Sotomayor pledged to “do equal right to the poor and to the rich,” the AP reported.

She swore a first oath in a private ceremony in the room where the justices hold their private conferences.

Obama nominated Sotomayor, who has been a judge for 17 years, in May to take the place of Justice David Souter, who had announced his retirement. The Senate confirmed her nomination Thursday by a 68-31 vote.