From the Catholic Encyclopedia (see link below):
Born at Florence, 11 December, 1475; died at Rome, 1 December, 1521, was the second son of Lorenzo the Magnificent (1449-1492) and Clarice Orsini, and from his earliest youth was destined for the Church. He received tonsure in 1482 and in 1483 was made Abbot of Font Douce in the French Diocese of Saintes and appointed Apostolic prothonotary by Sixtus IV. On 11 March Giovanni de' Medici, then but thirty-eight years old, was elected pope. the large treasure left by Julius II was entirely dissipated in two years. In the spring of 1515 the exchequer was empty and Leo never after recovered from his financial embarrassment. Various doubtful and reprehensible methods were resorted to for raising money. He created new offices and dignities, and the most exalted places were put up for sale. Jubilees and indulgences were degraded almost entirely into financial transactions, yet without avail, as the treasury was ruined. The pope's income amounted to between 500,000 and 600,000 ducats. The papal household alone, which Julius II had maintained on 48,000 ducats, now cost double that sum. In all, Leo spent about four and a half million ducats during his pontificate and left a debt amounting to 400,000 ducats. The most important occurrence of Leo's pontificate and that of gravest consequence to the Church was the Reformation, which began in 1517. We cannot enter into a minute account of this movement, the remote cause of which lay in the religious, political, and social conditions of Germany. It is certain, however, that the seeds of discontent amid which Luther threw his firebrand had been germinating for centuries. The immediate cause was bound up with the odious greed for money displayed by the Roman Curia, and shows how far short all efforts at reform had hitherto fallen
Pope Leo X was born on December 11, 1475.
Pope Leo X was not married and many of his contemporaries considered him to be a homosexual.
He chose the name Leo at the time of his election as pope.
Pope Leo became the Pope in 1513, his name also changed from Giovanni di Lorenzo de' Medici to Pope Leo.
Pope Leo X, who was pope from March 9, 1513, to December 1, 1521, excommunicated Luther.
Pope Leo X was responsible for the rebuilding of Saint Peter's Basilica in Rome.
Pope Leo XIII was the predecessor of Pope Pius X.
The date of his birth is not recorded but it occurred about the year AD400.
The Pope during Martin Luther's posting of the Ninety-Five Theses was Pope Leo X.
Leo X died December 1, 1521.
Leo X died at the age of 45.
Pope Pius X became pope in 1903 following the death of Pope Leo XIII.