According to the Catholic Encyclopedia, Pope John X was followed by Leo VI. See attached link for a complete list of popes.
All the popes listed below had the given name of Giovanni, In some cases it was a second or third name. Pope John I Pope John VIII Pope John IX Pope John X Pope John XI Pope John XVIII Pope Gelasius II Pope Nicholas III Pope Innocent VIII Pope Leo X Pope Julius III Pope Paul IV Pope Pius IV Pope Urban VII Pope Innocent IX Pope Innocent X Pope Clement XI Pope Clement XIV Pope Pius VI Pope Pius IX Pope Benedict XV Pope Pius XII Pope Paul VI
Canonizations occur every few months so anything listed here would soon become obsolete. A list of recent canonizations can be found at this link.
Of course, Benedict was a real pope, elected by the College of Cardinals in 2005 to replace John Paul II. However, Pope Benedict X was an anti-pope.
Pope John Paul I was elected pope upon the death of Pope Paul VI in 1978. He served only 33 days when he died and was succeeded by Pope John Paul II.
Pope Pius X became pope in 1903 following the death of Pope Leo XIII.
That was Pope John-Paul I, but he died after only 34 days in office.
Pope Leo XIII was the predecessor of Pope Pius X.
Pope Leo XIII (1878-1903)Pope St. Pius X (1903-14)Pope Benedict XV (1914-22)Pope Pius XI (1922-39)Pope Pius XII (1939-58)Pope John XXIII (1958-63)Pope Paul VI (1963-78)Pope John Paul I (August-September 1978)Pope John Paul II (1978-2005)Pope Benedict XVI (2005-2013)Pope Francis (2013-)
Pope Saint Pius X was pope in 1912.
The popes are always old men, so they usually are 70 or 80 years old.
Pope Leo X, who was pope from March 9, 1513, to December 1, 1521, excommunicated Luther.
Pope Gregory X was born in 1210.