Born in Barcelona on 2 November 1900. His father, Valentí, was born in a little village, Pla de Sant Tirs, in the Upper Urgell comarca, from where he moved to Barcelona. His mother was a native of Barcelona, born in the Sants barrio. Dionis was born in the family home at No 35, Calle Manso, fifth floor.
He was no more than 8 years old when he started working in a glass factory, joining the CNT at a very early age. In August 1919 he was jailed, as he was again in May and November 1920. On 30 November 1920, he was banished to the fortress of La Mola in Mahón, remaining there until October 1922.
The vessel Giraldo set sail from Barcelona with 35 anarcho-syndicalists plus Lluis Companys, a Barcelona city councillor on board. Those 35 were the CNT élite at the time and had been sentenced for their roles in the La Canadiense strike in 1919. They were: Salvador Seguí Rubinat, Manuel Salvador Serrano, Camilo Piñón Orihuela, Francisco Comas Pagès, Viçenç Botella Moya, Narcis Vidal Cucurella, Eusebio Manzanares Barrera, Martín Barrera Maresma, Miguel Abós Serena, Antoni Soler Cuadrado, Josep Viadiu Valls, Enrique Rueda Lopez, Aniceto López Dalmau, Emilio Albaricias Descarga, Manuel Núñez García, Saturnino Meca González, Dionisio Eroles Batlle, Antonio Ocaña Martín, Josep Soler Guillemat, Manuel Casterienas Domingo, José Francàs Jarquin, Josep Roigé Redondo, Guillermo Vales Brugera, Daniel Rebull Cabré, José Antonio Gómez Vicente, Eusebio Jorge Sánchez, Salvador Pascua Mascaró, Antonio Calomarte Costa, Salvador Caracena Díaz, Ramón Recasens Miret, Francisco Arsia Simón, Jesús Vega Fernández and Antonio Amador Obón.