Luigi Rossi (c. 1597 – 20 February 1653) was an Italian Baroque composer.
 Rossi was born in Torremaggiore, a small town near Foggia, in the ancient kingdom of Naples and at an early age he went to Naples.
 There he studied music with the Franco-Flemish composer Jean de Macque who was organist of the Santa Casa dell’Annunziata and "maestro di cappella" to the Spanish viceroy.
 Rossi later entered the service of the Caetani, dukes of Traetta.
Giovanni Bononcini (or Buononcini) (18 July 1670 – 9 July 1747) (sometimes cited also as Giovanni Battista Bononcini) was an Italian Baroque composer, cellist, singer and teacher, one of a family of string players and composers.
Giovanni Mossi (c. 1680?
 in Rome – 1742 in Rome) was an Italian baroque composer.
Giuseppe Maria Orlandini (4 April 167624 October 1760) was an Italian baroque composer particularly known for his more than 40 operas and intermezzos.
 Highly regarded by music historians of his day like Francesco Saverio Quadrio, Jean-Benjamin de La Borde and Charles Burney, Orlandini, along with Vivaldi, is considered one of the major creators of the new style of opera that dominated the second decade of the 18th century.
Lorenzo Ratti (ca. 1589–1630) was an Italian baroque composer.
 He was the predecessor of Carissimi at the Collegium Germanicum.
 He composed six Gospel Dialogues for the oratory.
 He was a teacher of Benevoli.
Antonio Lucio Vivaldi (] ; 4 March 1678 – 28 July 1741) was an Italian Baroque composer, virtuoso violinist, teacher and cleric.
 Born in Venice, he is recognized as one of the greatest Baroque composers, and his influence during his lifetime was widespread across Europe.
 He composed many instrumental concertos, for the violin and a variety of other instruments, as well as sacred choral works and more than forty operas. His best-known work is a series of violin concertos known as "The Four Seasons".
Nulla in mundo pax sincera, RV 630, is a sacred motet composed by Antonio Vivaldi in 1735 to an anonymous Latin text, the title of which may be translated as "In this world there is no honest peace" or "There is no true peace in this world without bitterness".
 Written in the key of E major and in the typical lyrical Italian Baroque style, it is scored for solo soprano, two violins, viola and basso continuo, this would normally be a cello and keyboard instrument, in Vivaldi's case often the organ.
 The text dwells on the imperfections of a world full of evil and sin, and praises Jesus for the salvation he offers from it.
 It is considered to be one of Vivaldi's most beautiful solo motets.
George Frideric (or Frederick) Handel ( ; born Georg Friedrich Händel ] ; 23 February 1685 (O.S.) [(N.S.) 5 March] – 14 April 1759) was a German, later British, baroque composer who spent the bulk of his career in London, becoming well known for his operas, oratorios, anthems, and organ concertos. Handel received important training in Halle and worked as a composer in Hamburg and Italy before settling in London in 1712; he became a naturalised British subject in 1727.
 He was strongly influenced both by the great composers of the Italian Baroque and by the middle-German polyphonic choral tradition.
Tomaso Giovanni Albinoni (8 June 1671 – 17 January 1751) was an Italian Baroque composer.
 While famous in his day as an opera composer, he is mainly remembered today for his instrumental music, such as the concerti.
Pietro Antonio Locatelli (3 September 1695 in Bergamo – 30 March 1764 in Amsterdam) was an Italian Baroque composer and violinist.

Question: What Italian Baroque composer composed Nulla in mundo pax sincera?
Answer: Antonio Vivaldi