Question: Why did Roncalli leave the city where the painter of Venus with a Mirror died?

Knowledge 1: Venus with a Mirror
Venus with a Mirror (about 1555) is a painting by Titian, now in the National Gallery of Art in Washington, DC, and it is considered to be one of the collection's highlights. [SEP] Knowledge 2: Pope John XXIII
Following the death of Pope Pius XII on 9 October 1958, Roncalli watched the live funeral on his last full day in Venice on 11 October. His journal was specifically concerned with the funeral and the abused state of the late pontiff's corpse. Roncalli left Venice for the conclave in Rome well aware that he was papabile,[b] and after eleven ballots, was elected to succeed the late Pius XII, so it came as no surprise to him, though he had arrived at the Vatican with a return train ticket to Venice.[citation needed] [SEP] Knowledge 3: The Martyrdom of Saint Lawrence (Titian)
The Martyrdom of Saint Lawrence is a 1558 painting by Titian, now in the church of I Gesuiti in Venice. It so impressed Philip II of Spain that he commissioned a second version in 1567 for the basilica at El Escorial.
Knowledge 1: Pope John XXIII
Following the death of Pope Pius XII on 9 October 1958, Roncalli watched the live funeral on his last full day in Venice on 11 October. His journal was specifically concerned with the funeral and the abused state of the late pontiff's corpse. Roncalli left Venice for the conclave in Rome well aware that he was papabile,[b] and after eleven ballots, was elected to succeed the late Pius XII, so it came as no surprise to him, though he had arrived at the Vatican with a return train ticket to Venice.[citation needed] [SEP] Knowledge 2: The Martyrdom of Saint Lawrence (Titian)
The Martyrdom of Saint Lawrence is a 1558 painting by Titian, now in the church of I Gesuiti in Venice. It so impressed Philip II of Spain that he commissioned a second version in 1567 for the basilica at El Escorial. [SEP] Knowledge 3: Venus with a Mirror
Venus with a Mirror (about 1555) is a painting by Titian, now in the National Gallery of Art in Washington, DC, and it is considered to be one of the collection's highlights.
Knowledge 1: Venus with a Mirror
Venus with a Mirror (about 1555) is a painting by Titian, now in the National Gallery of Art in Washington, DC, and it is considered to be one of the collection's highlights. [SEP] Knowledge 2: Pope John XXIII
Following the death of Pope Pius XII on 9 October 1958, Roncalli watched the live funeral on his last full day in Venice on 11 October. His journal was specifically concerned with the funeral and the abused state of the late pontiff's corpse. Roncalli left Venice for the conclave in Rome well aware that he was papabile,[b] and after eleven ballots, was elected to succeed the late Pius XII, so it came as no surprise to him, though he had arrived at the Vatican with a return train ticket to Venice.[citation needed] [SEP] Knowledge 3: Roncalli High School (Indiana)
Roncalli High School is a Catholic high school located in Indianapolis, Indiana. It is located on the south side of Indianapolis and run by the Roman Catholic Archdiocese of Indianapolis. Roncalli is named for Pope John XXIII, Angelo Giuseppe Roncalli.

Answer: for the conclave in Rome