João Marcelino Arroyo (Porto, 4 October 1861 - New Houses, Colares, Sintra, May 18, 1930), better known as João Arroio or João Arroyo, was a lawyer, university professor, Portuguese musician and politician. He studied law services at the University of Coimbra, that would become a full professor. It was a deputy, peer of the realm and three times minister, distinguishing himself as a brilliant intellectual and parliamentary speaker of great merit, dedicating himself from the new musical composition.

Born in Porto, in the heart of a family related with the artistic medium, composer and son of the basque musician José Francisco Arroyo, first director of the S. João Theatre, Porto, and brother of the well-known engineer and art critic Antonio Arroyo and Joseph Diogo Arroyo, this also a musician and singer, PhD in Chemistry from the University of Coimbra, political and Professor of Inorganic Chemistry and director of the Faculty of Science, University of Porto.

After conducting preliminary studies in his hometown, he enrolled in law school at the University of Coimbra. While still a student at that university, led in 1880, under the celebrations of the tercentenary of  Camões, the foundation of Orfeon Academic of Coimbra,whe he was first director. In the premiere show of the Choral Society, John Arroyo directed the orchestra that accompanied his brother Antonio Arroyo, who sang a solo.

Doctorate in law in 1884 and in December 1895 he was appointed professor of the Faculty of Law of Coimbra. He was linked with his brothers and some friends, the Journal of the foundation News in Porto (1888), that José Diogo Arroyo was the first director. He was elected in December 9, 1892 member of the Royal Academy of Sciences, Letters in class.

In 1884, he was elected deputy for the constituency of Vila do Conde, built in the lists of the Regenerator Party, remaining in the House until 1902, accumulating with the teaching activity. In 1890, with only 29 years old, he was appointed Minister of Navy and Overseas ministry of Serpa Pimentel, after the Progressive government fell following the ultimatum. It was also Minister of Education and Fine Arts of 5 April to 13 October 1890. The ministerial action was short and slight, contrasting with his numerous parliamentary interventions that have shown great orator qualities. In the parliamentary proceedings there interventions and referrals to João Arroyo in about two thousand pages, between 1884 and 1910. Still he found time to be member of the Court of Auditors and administrator of the Royal Company of the Portuguese Railways, circumstances that made him rich , which holds a large collection of art and a mansion in Telhal Street in Lisbon, attended by all the high society of the Portuguese capital.

In 1900-1901 he joined the government headed by Hintze Ribeiro, this time with the Minister of Foreign Affairs folder. In 1902, the year he broke with Hintze Ribeiro, was named Peer of the Realm. During the last years of Monarchy, John Arroyo was one of the most prominent members of the parliamentary opposition, becoming noted for his speeches in the House of Lords against John Franco, King Carlos and Queen Amelia, which terrified the monarch . Its violence against the king would explain the refusal of this, in naming him to the State Council. On the eve of the Republican Revolution on 4 October 1910, John Brook was appointed ambassador in Paris, a position he no longer came to mind. In 1911 he was dismissed from university professor, although the monarchist historian António Cabral it found one of the blame for the fall of the monarchy.

Published numerous legal studies, including a study on the succession legitimize (Coimbra, 1884), Two exceptions in the Portuguese Civil Procedure (Porto, 1884) and a second study on the succession legitimize (Coimbra, 1885). Also dedicated to the letters and music, having edited a book of poetry (1915) and musical pieces, including compositions for Histoire simple piano, Thème avec variations and the scherzo angoscia and Charming (1908), the Leonor Teles operas and lyrical drama Doomed Love (1861), the latter inspired by the novel by Camilo Castelo Branco and libretto in Italian by Francisco Bernardo Braga Junior, was premiered in 1907 at the Theatre of San Carlos then with great success in Hamburg (1910), and returned to be presented in 2008, a Portuguese version, staged by the Opera Company North. Also composed a cantata, Inês de Castro, still unpublished, and Symphonic Poem based on a cycle of sonnets published in 1918, which was played in 1913 at the Teatro da Trindade. His last opera, Paul and Lena, was never completed, and premiered as a play in 1917 at the Teatro Republic, in Lisbon, and published in 1918.

Towards the Orfeon Academic Coimbra printed a grand design and romantic choral music, with a climactic dynamic, joining voices, instruments and soloists, in an approach of musical arias to great effect and acceptance. Included in the repertoire works such as the Hunters' Choir (wohl auf Erden Was gleicht) Carl Maria von Weber, the Tannhäuser march of Richard Wagner and the Academic Hymn of José Medeiros, getting to have about 250 performers, among orfeonistas and musicians.