Question: What monarch of three kingdoms on England, Scotland and Ireland, had his portraits painted by Flemish Baroque artist Anthony van Dyck?
Context: Samson and Delilah is a 1630 painting by Anthony van Dyck.  Like his 1620 version of the subject, it is in the style of his former master Peter Paul Rubens.  Unlike Rubens, however, van Dyck shows Delilah seemingly appalled at her own betrayal of Samson and regretting her act of treason, whereas Rubens showed him as a captive and her as an unscrupulous temptress.  Van Dyck's palette in the work also reveals the influence of Titian during van Dyck's stay in Italy.  It is now in the Kunsthistorisches Museum in Vienna. Sir Anthony van Dyck (] , many variant spellings; 22 March 1599 – 9 December 1641) was a Flemish Baroque artist who became the leading court painter in England, after enjoying great success in Italy and Flanders.  He is most famous for his portraits of Charles I of England and his family and court, painted with a relaxed elegance that was to be the dominant influence on English portrait-painting for the next 150 years.  He also painted biblical and mythological subjects, displayed outstanding facility as a draughtsman, and was an important innovator in watercolour and etching.  The Van Dyke beard is named after him. Gonzales Coques (between 1614 and 1618 - 18 April 1684) was a Flemish painter of portraits and history paintings. Because of his artistic proximity to and emulation with Anthony van Dyck he received the nickname "de kleine van Dyck" (the little van Dyck).  Coques also worked as an art dealer. Hendrick van Balen or Hendrick van Balen I (c. 1573-1575 in Antwerp – 17 July 1632 in Antwerp) was a Flemish Baroque painter and stained glass designer.  Hendrick van Balen specialised in small cabinet pictures often painted on a copper support.  His favourite themes were mythological and allegorical scenes and, to a lesser extent, religious subjects.  The artist played an important role in the renewal of Flemish painting in the early 17th century and was one of the teachers of Anthony van Dyck. Theodosius and Ambrose is a 1615/16 painting by Peter Paul Rubens, with assistance from his main pupil Anthony van Dyck.  It is now in the Kunsthistorisches Museum in Vienna.  Rubens created the preparatory drawing, with the painting almost entirely done by van Dyck, who painted his own similar version of the subject a few years later.  In the Rubens version, the architectural background is less defined, Theodosius is bearded and the spear and halberd in van Dyck's own version are omitted. Lucas Franchoys the Younger or Lucas Franchoys II (alternative spellings of name: Lucas Franchois, Lucas François, Louis Franchoys) (28 June 1616 in Mechelen – 3 April 1681 in Mechelen) was a Flemish Baroque painter from Mechelen, who painted numerous altarpieces and portraits in a style reminiscent of Anthony van Dyck. Jan Boeckhorst or Johann Bockhorst (c. 1604 – 21 April 1668), was a German-born Flemish Baroque painter and draughtsman.  He was a versatile artist who produced history paintings, genre scenes and portraits in a style influenced by the trio of leading Baroque painters in Antwerp Peter Paul Rubens, Anthony van Dyck and Jacob Jordaens. Pieter de Jode II or Pieter de Jode the Younger (1606–1674) was a Flemish Baroque printmaker, draughtsman, painter and art dealer.  A scion of an important dynasty of printmakers active in Antwerp, he created many prints after the works of leading painters and was a close collaborator of Anthony van Dyck for whom he engraved many portraits. Charles I (19 November 1600 – 30 January 1649 ) was monarch of the three kingdoms of England, Scotland, and Ireland from 27 March 1625 until his execution in 1649. Jacob (Jacques) Jordaens (19 May 1593 – 18 October 1678) was a Flemish painter, draughtsman and tapestry designer known for his history paintings, genre scenes and portraits.  After Peter Paul Rubens and Anthony van Dyck, he was the leading Flemish Baroque painter of his day.  Unlike those contemporaries he never travelled abroad to study Italian painting, and his career is marked by an indifference to their intellectual and courtly aspirations.  In fact, except for a few short trips to locations in the Low Countries, he remained in Antwerp his entire life.  As well as being a successful painter, he was a prominent designer of tapestries.  Like Rubens, Jordaens painted altarpieces, mythological, and allegorical scenes, and after 1640—the year Rubens died—he was the most important painter in Antwerp for large-scale commissions and the status of his patrons increased in general.  However, he is best known today for his numerous large genre scenes based on proverbs in the manner of his contemporary Jan Brueghel the Elder, depicting "The King Drinks" and "As the Old Sing, So Pipe the Young".  Jordaens' main artistic influences, besides Rubens and the Brueghel family, were northern Italian painters such as Jacopo Bassano, Paolo Veronese, and Caravaggio.
Answer: Charles I of England