For example:
ALEXANDER VI: (1431 - 1503, Pope from 1492 - 1503)
Alexander is the most notorious pope in all of history. He conducted a pontificate of nepotism, greed, ruthlessness, murder, and, as McBrien has described it, "unbridled sensuality." He became the leading figure in the saga of the Borgia family, both as a perpetuator of evil and a facilitator of the activities of the two most famous of his children, Cesare and Lucrezia.
The second and last of the Spanish popes literally bought his pontificate with bribes. Such a purchased election is called "simoniacal," and was easily accomplished with the greed of seventeen of the twenty-two cardinals voting for the new pope.
Alexander VI Adoring the Risen Christ (Pinturicchio)
He was born Rodrigo Borgia near Valencia, Spain, the nephew of Callixtus, who made him a cardinal at the age of twenty-five (1456) and vice-chancellor of the Holy See (1457). As vice-chancellor, he amassed great wealth, lived an openly promiscuous life, and fathered seven children, both as a cardinal and the pope. Pius II, who had succeeded Callixtus and continued to support the rise in the church hierarchy of Cardinal Rodrigo Borgia, had to warn the young cardinal to refrain from his practice of participating in orgies. It was, as Pius expressed it, "unseemly."
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While a cardinal, he took as his mistress Vannozza de Catanei who bore him four children, including Cesare (born 1475) and Lucrezia (born, 1480). By the time he became pope in 1492, he had cast off Vannozza and acquired as a mistress the young Guilia Farenese, who was probably the mother of two or three additional children sired by Alexander. Before Vannozza, Rodrigo had fathered at least two children by one or more women whose names are lost to history.
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http://www.crimelibrary.com/serial_killers/history/borgias/2.html?sect=6THIS IS A FASCINATING READ. I would like to see a good historian compare the evil of the Bushes and Borgias.