Antonio Lucio Vivaldi (4 March 1678 – 28 July 1741) was an Italian composer, virtuoso violinist, impresario of Baroque music, and Roman Catholic priest. He is regarded as one of the leading Baroque composers, with a significant influence across Europe during his lifetime. Vivaldi contributed to developments in orchestration, violin technique, and programmatic music. He played a key role in consolidating the concerto form, particularly the solo concerto, into a widely recognised musical idiom. Vivaldi composed numerous instrumental concertos for violin and other instruments, sacred choral works, and more than fifty operas. His best-known work is a set of violin concertos called "The Four Seasons." Many of his compositions were created for the all-female music ensemble of the Ospedale della Pietà, an institution for abandoned children. He began studying for the Catholic priesthood at the age of 15 and was ordained at 25, but was later dispensed from saying public Masses due to health issues. Vivaldi achieved some success with elaborate opera productions in Venice, Mantua, and Vienna. After meeting Emperor Charles VI, Vivaldi moved to Vienna seeking royal patronage. However, the Emperor died shortly after his arrival, and Vivaldi died in poverty less than a year later. Vivaldi’s music experienced a decline in reputation for nearly two centuries but underwent a revival in the early 20th century, accompanied by extensive scholarly research. Many of his works, once thought lost, have been rediscovered, including some as recently as 2015. His music remains popular and is frequently performed worldwide.