As cardinals gather at the Sistine Chapel to begin voting for a successor to Pope Francis, there is no single frontrunner, and it remains unclear whether the new pope will align with Francis’s more inclusive ideology.

Francis’ successor will be selected by cardinals at the conclave that begins on May 7. Cardinals, known as the “princes of the church,” rank just below the pope in the Roman Catholic Church; together, they are known as the College of Cardinals. When a pope dies, the college chooses a successor.

The great doors of the Sistine Chapel shut Wednesday after the cry of “extra omnes” — Latin for “all out” — and 133 cardinals began the secretive, centuries-old ritual of electing a new pope to lead the Catholic Church,