Editing Pope Gregory XV (section)

===Papal conclave===
{{main|1621 papal conclave}}
Ludovisi remained in his [[episcopal see]] in Bologna until he went to Rome after the death of [[Pope Paul V]] to take part in the conclave at which he was chosen as pope and he selected the pontifical name of "Gregory XV". He was [[Papal coronation|crowned]] on 14 February 1621 by the [[protodeacon]], Cardinal [[Andrea Baroni Peretti Montalto]], and assumed possession of the [[Basilica of Saint John Lateran]] on 14 May 1621.

At the moment of his election, chiefly through the influence of Cardinal [[Scipione Borghese]], at his advanced age (he was 67) and with his weak state of health he saw at once that he would need an energetic man, in whom he could place implicit confidence, to assist him in the government of the Church. His nephew [[Ludovico Ludovisi]], a young man of 25 years, seemed to him to be the right person and, at the risk of being charged with [[nepotism]], he created him cardinal on the third day of his pontificate. On the same day, his youngest brother [[Orazio Ludovisi|Orazio]] was appointed [[Captain General of the Church]] at the head of the Papal army.{{sfn|Ott|1910}}
[[File:Ludovico Ludovisi with Gregory XV.jpg|thumb|150px|Pope Gregory XV with his [[cardinal-nephew]] of unprecedented income and authority, [[Ludovico Ludovisi]], known as ''il cardinale padrone'']]

The future revealed that Gregory XV was not disappointed in his nephew. The ''[[Catholic Encyclopedia]]'' allows that "Ludovico, it is true, advanced the interests of his family in every possible way, but he also used his brilliant talents and his great influence for the welfare of the Church, and was sincerely devoted to the pope".{{sfn|Ott|1910}} Gregory secured for the Ludovisi two dukedoms, one for his brother Orazio, made a ''Nobile Romano'' and [[Duke]] of [[Fiano Romano]], 1621, and the other, the [[Duchy]] of [[Zagarolo]], purchased from the [[Colonna family|Colonna]] family by his nephew [[Ludovico Ludovisi]] in 1622. A second nephew, [[Niccolò Ludovisi|Niccolò]], was made reigning [[Principality of Piombino|Prince of Piombino]] and Lord of the Isola d'[[Elba]] in 1634, having married the heiress, 30 March 1632.