On 4 April 1910, Mascagni began a relationship with Anna Lolli.
In October he was reconciled with Puccini.

Mascagni ceased his activity as director of the Scuola Musicale Romana in 1911.
That May he left for Buenos Aires, beginning a seven-month tour in South America.
The première of Isabeau took place in Buenos Aires on 2 June.

The Italian première of Isabeau was held simultaneously at La Scala in Milan (conductor Tullio Serafin) and at La Fenice in Venice (conductor Mascagni) in 1912.
On 28 March, he began to work on Parisina in Bellevue, near Paris, sometimes with his daughter Emi, his mistress Anna Lolli, and the librettist Gabriele d'Annunzio.

Parisina was premiered in Milan on 15 December of that year.
Almost all the important Italian composers of the time were present, among them Puccini, Umberto Giordano and Riccardo Zandonai.
The new work was premiered in Livorno and Rome in 1914.
On 28 July occurred the events that shortly led to World War I: Puccini and Mascagni were against the involvement of Italy in this war, in which Mascagni's son Dino was later made a prisoner.

In 1915 Mascagni wrote music for Nino Oxilia's movie Rapsodia Satanica; the custom was for silent films to be accompanied live in a theater by organ, piano, or an orchestra, often using a prepared score (sometimes with original music) with cues for the conductor or musician.
Mascagni had a quarrel regarding the rights of Louise de la Ramée's Two Little Wooden Shoes (I due Zoccoletti), that inspired both Puccini and Mascagni.
The subject was retained by Mascagni for Lodoletta.
The latter opera was premiered on 30 April 1917 in Rome.
 The Livornese première of the opera was on 28 July with Beniamino Gigli as Flammen.

Sì, Mascagni's operetta, which he had been manoeuvred into writing by the impresario Carlo Lombardo, was premiered on 13 December in Rome.
On 4 April 1910, Mascagni began a relationship with Anna Lolli. In October he was reconciled with Puccini.
Mascagni ceased his activity as director of the Scuola Musicale Romana in 1911. That May he left for Buenos Aires, beginning a seven-month tour in South America. The première of Isabeau took place in Buenos Aires on 2 June.
The Italian première of Isabeau was held simultaneously at La Scala in Milan (conductor Tullio Serafin) and at La Fenice in Venice (conductor Mascagni) in 1912. On 28 March, he began to work on Parisina in Bellevue, near Paris, sometimes with his daughter Emi, his mistress Anna Lolli, and the librettist Gabriele d'Annunzio.
Parisina was premiered in Milan on 15 December of that year. Almost all the important Italian composers of the time were present, among them Puccini, Umberto Giordano and Riccardo Zandonai. The new work was premiered in Livorno and Rome in 1914. On 28 July occurred the events that shortly led to World War I: Puccini and Mascagni were against the involvement of Italy in this war, in which Mascagni's son Dino was later made a prisoner.
In 1915 Mascagni wrote music for Nino Oxilia's movie Rapsodia Satanica; the custom was for silent films to be accompanied live in a theater by organ, piano, or an orchestra, often using a prepared score (sometimes with original music) with cues for the conductor or musician. Mascagni had a quarrel regarding the rights of Louise de la Ramée's Two Little Wooden Shoes (I due Zoccoletti), that inspired both Puccini and Mascagni. The subject was retained by Mascagni for Lodoletta. The latter opera was premiered on 30 April 1917 in Rome.  The Livornese première of the opera was on 28 July with Beniamino Gigli as Flammen.
Sì, Mascagni's operetta, which he had been manoeuvred into writing by the impresario Carlo Lombardo, was premiered on 13 December in Rome.
Pietro Mascagni