The election of a new pope has begun following the death of Pope Francis last month. The secret conclave of 131 Catholic cardinals are locked in the Sistine Chapel in the Vatican City until a new pontiff is chosen.

Here is a look at what betting odds say about the frontrunner to become the next leader of the Catholic Church.

Francis’ successor will be selected by cardinals at the conclave that began 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.