Born: Probably 1825, Tortosa, Spain.
Cosidó went to live in Bordeaux, France, where he accepted Christ at the end of 1857, through the Sevillian evangelist Manuel Pinto.
In 1858, as an agent of the French Bible Society, he was transferred to the Paris Committee, where he continued working to spread the Gospel. That led him to travel to the south of France, reaching the Aran Valley.
Helped by the Societé Bíblique Protestante and the Societé Evangélique, he devoted his drive and effort to the dissemination of the Bible, using the Reina-Valera version and non-Catholic translations.
Before the Revolution he went to work in Madrid, and after the Revolution began cooperating with William Gould of the Assemblies of Brothers.
His great love of writing poetry led him to write hymns that are still well known in churches today.
In 1870, Cosidó was in Barcelona for a month when a yellow fever epidemic caused havoc among the population. After preaching in the church of Barceloneta, he went to Valencia to start new work.
On the way, he stayed a few days with his family in Tortosa, where he began to notice the symptoms of the disease. He was quarantined, but died shortly thereafter.