The Infantas Isabel Clara Eugenia and Catalina Micaela

Alonso Sánchez Coello (c. 1531 – 8 August 1588) was an Iberian portrait painter of the Spanish and Portuguese Renaissance. He is mainly known for his portrait paintings executed in a style which combines the objectivity of the Flemish tradition with the sensuality of Venetian painting. He was court painter to Philip II.

Alonso Sánchez Coello was born in Benifairó de les Valls, near Valencia in Spain. He spent his childhood there until the death of his father when he was around ten years old. He left for Portugal c. 1541 or 1542 to live with his grandfather, who was then in the service of the Portuguese monarchs and had been raised to the Portuguese nobility. Coello's years in Portugal and his family name of Portuguese origin led to a long-standing belief that he was in fact Portuguese.

His grandfather's master King John III of Portugal sent the young painter to study with Anthonis Mor (also known as Antonio Moro) in Flanders around 1550. He came under the protection of Antoine de Granville, bishop of Arras, who was also a patron of Mor.

In 1552, the painter went to Lisbon with Anthonis Mor when Charles V commissioned Mor to paint the Portuguese royal family.