After Schubert died in 1828, his music was forgotten until his older brother Ferdinand delivered a trunk full of manuscripts to Robert Schumann, who at the time was the publisher of the leading journal of music in the German speaking world. That was around 1850 or so. Schumann edited the manuscripts along with his younger colleague Johannes Brahms, and they saw to the publication of Schubert's songs, symphonies and chamber music. But that was primarily in the German speaking world.
It was Sir Arthur Sullivan who singlehandedly took on the task of bringing Schubert to the English speaking world during the Victorian Era. He was successful, needless to say.