This section is from the book "The Life Of Cesare Borgia", by Rafael Sabatini. Also available from Amazon: The Life of Cesare Borgia.
Don Pedro Luis made haste to depart, contrived to avoid the Orsini, who had made him their special quarry, and getting a boat slipped down the Tiber to Civita Vecchia, where he died suddenly some six weeks later, thereby considerably increasing the wealth of Roderigo, his brother and his heir.
Roderigo's cousin, Don Luis Juan, Cardinal-Presbyter of Santi Quattro Coronati, another member of the family who owed his advancement to his uncle Calixtus, thought it also expedient to withdraw from that zone of danger to men of his nationality and name.
Roderigo de Lanzol y Borja alone remained leastways, the only prominent member of his house boldly to face the enmity of the majority of the Sacred College, which had looked with grim disfavour upon his uncle's nepotism. Unintimidated, he entered the Conclave for the election of a successor to Calixtus, and there the chance which so often prefers to bestow its favours upon him who knows how to profit by them, gave him the opportunity to establish himself as firmly as ever at the Vatican, and further to advance his interests.
It fell out that when the scrutiny was taken, two cardinals stood well in votes the brilliant, cultured Enea Silvio Bartolomeo de' Piccolomini, Cardinal of Siena, and the French Cardinal d'Estouteville though neither had attained the minimum majority demanded. Of these two, the lead in number of votes lay with the Cardinal of Siena, and his election therefore might be completed by Accession that is, by the voices of such cardinals as had not originally voted for him until the minimum majority, which must exceed two thirds, should be made up.
The Cardinal Vice-Chancellor Roderigo de Lanzol y Borja led this accession, with the result that the Cardinal of Siena became Pontiff as Pius II and was naturally enough disposed to advance the interests of the man who had been instrumental in helping him to that eminence. Thus, his position at the Vatican, in the very face of all hostility, became stronger and more prominent than ever.
A letter written two years later from the Baths at Petriolo by Pius II to Roderigo when the latter was in Siena whither he had been sent by his Holiness to superintend the building of the Cathedral and the Episcopal and Piccolomini palaces is frequently cited by way of establishing the young prelate's dissolute ways. It is a letter at once stern and affectionate, and it certainly leaves no doubt as to what manner of man was the Cardinal Vice-Chancellor in his private life, and to what manner of unecclesiastical pursuits he inclined. It is difficult to discover in it any grounds upon which an apologist may build.
" Beloved Son,
" When four days ago, in the gardens of Giovanni de Bichis, were assembled several women of Siena addicted to worldly vanity, your worthiness, as we have learnt, little remembering the office which you fill, was entertained by them from the seventeenth to the twenty second hour. For companion you had one of your colleagues, one whom his years if not the honour of the Holy See should have reminded of his duty. From what we have heard, dancing was unrestrainedly indulged, and not one of love's attractions was absent, whilst your behaviour was no different from that which might have been looked for in any worldly youth. Touching what happened there, modesty imposes silence. Not only the circumstance itself, but the very name of it is unworthy in one of your rank. The husbands, parents, brothers, and relations of these young women were excluded, in order that your amusements should be the more unbridled. You with a few servants undertook to direct and lead those dances. It is said that nothing is now talked of in Siena but your frivolity. Certain it is that here at the baths, where the concourse of ecclesiastics and laity is great, you are the topic of the day. Our displeasure is unutterable, since all this reflects dishonourably upon the sacerdotal estate and office. It will be said of us that we are enriched and promoted not to the end that we may lead blameless lives, but that we may procure the means to indulge our pleasures. Hence the contempt of us entertained by temporal princes and powers and the daily sarcasms of the laity. Hence also the reproof of our own mode of life when we attempt to reprove others. The very Vicar of Christ is involved in this contempt, since he appears to countenance such things. You, beloved son, have charge of the Bishopric of Valencia, the first of Spain ; you are also Vice-Chancellor of the Church; and what renders your conduct still more blameworthy is that you are among the cardinals, with the Pope, one of the counsellors of the Holy See. We submit it to your own judgement whether it becomes your dignity to court young women, to send fruit and wine to her you love, and to have no thought for anything but pleasure. We are censured on your account; the blessed memory of your uncle Calixtus is vituperated, since in the judgement of many he was wrong to have conferred so many honours upon you. If you seek excuses in your youth, you are no longer so young that you cannot understand what duties are imposed upon you by your dignity. A cardinal should be irreproachable, a model of moral conduct to all. And what just cause have we for resentment when temporal princes bestow upon us titles that are little honourable, dispute with us our possessions, and attempt to bend us to their will ? In truth it is we who inflict these wounds upon ourselves, and it is we who occasion ourselves these troubles, undermining more and more each day by our deeds the authority of the Church. Our guerdon is shame in this world and condign punishment in the next. May your prudence therefore set a restraint upon these vanities and keep you mindful of your dignity, and prevent that you be known for a gallant among married and unmarried women. But should similar facts recur, we shall be compelled to signify that they have happened against our will and to our sorrow, and our censure must be attended by your shame. We have always loved you, and we have held you worthy of our favour as a man of upright and honest nature. Act therefore in such a manner that we may maintain such an opinion of you, and nothing can better conduce to this than that you should lead a well ordered life. Your age, which is such as still to promise improvement, admits that we should admonish you paternally."
 
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