Britannica Sources used in this answer

Which papal conclaves did Cardinal Giovanni de’ Medici attend in 1503?

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Leo X — Leo X Pope Leo X, contemporary medallion; in the coin collection of the Vatican Library.

In 1503, Cardinal Giovanni de’ Medici (the future Pope Leo X) participated in two papal conclaves:

The September conclave, which resulted in the election of Pope Pius III.
The October conclave, which resulted in the election of Pope Julius II.1