He composed a set of twelve concertos for solo violins and strings, called l'estro armonico as well as the operas Orlando Furioso, and Juditha Triumphans.  
He composed a set of twelve concertos for solo violins and strings, called l'estro armonico as well as the operas Orlando Furioso, and Juditha Triumphans.  He was ordained in 1703  and came to be called the "Red Priest" due to the color of his hair. He never actually was a priest, however, but rather a teacher of violin for orphan girls in Venice. For ten points, who was this composer of a set of 1725 concertos called The Contest Between Harmony and Invention, a collection which includes The Four Seasons?
He composed a set of twelve concertos for solo violins and strings, called l'estro armonico as well as the operas Orlando Furioso, and Juditha Triumphans.  
Antonio Vivaldi