Giovanni Battista Calandra (1568- c. 1644) was an Italian

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 mosaic

Mosaic

Mosaic is the art of creating images with an assemblage of small pieces of colored glass, stone, or other materials. It may be a technique of decorative art, an aspect of interior decoration, or of cultural and spiritual significance as in a cathedral...

 artist in the Vatican

Vatican City

Vatican City , or Vatican City State, in Italian officially Stato della Città del Vaticano , which translates literally as State of the City of the Vatican, is a landlocked sovereign city-state whose territory consists of a walled enclave within the city of Rome, Italy. It has an area of...

.

He was born at Vercelli

Vercelli

Vercelli is a city and comune of about 47,000 inhabitants in the Province of Vercelli, Piedmont, northern Italy. One of the oldest urban sites in northern Italy, it was founded, according to most historians, around the year 600 BC.The city is situated on the river Sesia in the plain of the river...

 in 1568. In the pontificate of Urban VIII, it was found that the dampness of St. Peter's

St. Peter's Basilica

The Papal Basilica of Saint Peter , officially known in Italian as ' and commonly known as Saint Peter's Basilica, is a Late Renaissance church located within the Vatican City. Saint Peter's Basilica has the largest interior of any Christian church in the world...

 materially affected canvases, and henceforth it was determined to remove the principal pictures, and to replace them with copies in mosaic, of which the first was executed by Calandra, after the St. Michael of Cesare D'Arpino. With this were The Four Doctors of the Church, St. Peter, St. Paul, and others in the cupolas, after the cartoons of D'Arpino, Romanelli

Giovanni Francesco Romanelli

Giovanni Francesco Romanelli was an Italian painter of the Baroque.Romanelli was an Italian painter of the seventeenth century and trained in Rome in the studio of Pietro da Cortona, the leading painter of the time....

, Lanfranco

Giovanni Lanfranco

Giovanni Lanfranco was an Italian painter of the Baroque period.-Biography:Giovanni Gaspare Lanfranco was born in Parma, the third son of Stefano and Cornelia Lanfranchi, and was placed as a page in the household of Count Orazio Scotti...

, Sacchi

Andrea Sacchi

Andrea Sacchi was an Italian painter of High Baroque Classicism, active in Rome. A generation of artists who shared his style of art include the painters Nicolas Poussin and Giovanni Battista Passeri, the sculptors Alessandro Algardi and François Duquesnoy, and the contemporary biographer Giovanni...

, and Pellegrini. The mosaic art was afterwards carried to a much higher degree of perfection by the Cristofori. He also executed a Madonna after Raphael

Raphael

Raffaello Sanzio da Urbino , better known simply as Raphael, was an Italian painter and architect of the High Renaissance. His work is admired for its clarity of form and ease of composition and for its visual achievement of the Neoplatonic ideal of human grandeur...

 for the Christina, Queen of Sweden.