Question: In which town in Tuscany can you find a gallery, considered the most important and most visited, which houses the Portrait of Lucrezia Panciatichi?

Context articles: BP Portrait Award
National Portrait Gallery, London
Johann Jakob Dorner the Elder
Streatham portrait
Portrait of Lucrezia Panciatichi
Art Treasures Exhibition, Manchester 1857
Uffizi
Edward Savage (artist)
Portrait of Eleanor of Toledo
Portrait of Bartolomeo Panciatichi

The BP Portrait Award is an annual portraiture competition held at the National Portrait Gallery in London, England.
 It is the successor to the John Player Portrait Award.
 It is the most important portrait prize in the world, and is reputedly one of the most prestigious competitions in contemporary art.
 The "Daily Mail" has called it "the portraiture Oscars".
The National Portrait Gallery (NPG) is an art gallery in London housing a collection of portraits of historically important and famous British people.
 It was the first portrait gallery in the world when it opened in 1856.
 The gallery moved in 1896 to its current site at St Martin's Place, off Trafalgar Square, and adjoining the National Gallery.
 It has been expanded twice since then.
 The National Portrait Gallery also has regional outposts at Beningbrough Hall in Yorkshire and Montacute House in Somerset.
 It is unconnected to the Scottish National Portrait Gallery in Edinburgh, with which its remit overlaps.
 The gallery is a non-departmental public body sponsored by the Department for Culture, Media and Sport.
Johann Jakob Dorner the Elder, who was born at Ehrenstetten, near Freiburg in Breisgau, in 1741, was at first a pupil of Rösch at Freiburg and of Ignaz Bauer at Augsburg.
 He afterwards visited Italy, the Netherlands, and Paris; and excelled as a painter of historical and genre subjects.
 He was a professor and director of the Gallery at Munich in 1770, and died in that city in 1813.
 In the Darmstadt Gallery is a picture of 'Two Soldiers and a Maiden' by him; and in the Pinakothek at Munich, a 'Linen Draper,' which is a portrait of his wife, dated 1775.
The "Streatham" portrait is an oil painting on panel from the 1590s believed to be a later copy of a portrait of the English noblewoman Lady Jane Grey dating to her lifetime (1536/1537–54).
 It shows a three-quarter-length depiction of a young woman in Tudor-period dress holding a prayer book, with the faded inscription "Lady Jayne" or "Lady Iayne" in the upper-left corner.
 It is in poor condition and damaged, as if it has been attacked.
 Although of historical interest, it is generally considered to be of poor artistic quality.
 s of January 2015 the portrait is in Room 3 of the National Portrait Gallery in London.
The Portrait of Lucrezia Panciatichi is a painting by the Italian artist Agnolo di Cosimo, known as Bronzino, finished around 1545.
 It is housed in the Uffizi Gallery in Florence, Italy.
The Art Treasures of Great Britain was an exhibition of fine art held in Manchester, England, from 5 May to 17 October 1857.
 It remains the largest art exhibition to be held in the UK, possibly in the world, with over 16,000 works on display.
 It attracted over 1.3 million visitors in the 142 days it was open, about four times the population of Manchester at that time, many of whom visited on organised railway excursions.
 Its selection and display of artworks had a formative influence on the public art collections that were then being established in the UK, such as the National Gallery, National Portrait Gallery and the Victoria and Albert Museum.
The Uffizi Gallery (Italian: Galleria degli Uffizi , ] ) is a prominent art museum located adjacent to the Piazza della Signoria in the Historic Centre of Florence in the region of Tuscany, Italy.
 One of the most important Italian museums, and the most visited, it is also one of the largest and best known in the world, and holds a collection of priceless works, particularly from the period of the Italian Renaissance.
Edward Savage (November 26, 1761 in Princeton, Massachusetts – July 6, 1817 in Princeton, Massachusetts) was an American portrait painter and engraver.
 He was born in Princeton, Mass., and at first worked as a goldsmith, also practicing engraving.
 Although seemingly untrained in painting, he came into prominence in 1790 through his portrait of George Washington, intended as a gift to Harvard University.
 In 1791 he visited London, where he studied for a time under Benjamin West, and then went to Italy.
 Upon his return to the United States in 1794, he practiced in Philadelphia and New York City, maintaining for several years a picture gallery and art museum on Water Street in New York.
The Portrait of Eleanor of Toledo and Her Son is a painting by the Italian artist Agnolo di Cosimo, known as Bronzino, finished ca. 1545.
 One of his most famous works, it is housed in the Uffizi Gallery of Florence, Italy and is considered one of the preeminent examples of Mannerist portraiture.
 The painting depicts Eleanor of Toledo, the wife of Cosimo I de' Medici, Grand Duke of Tuscany, sitting with her hand resting on the shoulder of one of her sons.
 This gesture, as well as the pomegranate motif on her dress, referred to her role as mother.
 Eleanor wears a heavily brocaded dress with black arabesques.
 In this pose, she is depicted as the ideal woman of the Renaissance.
 The painting is the first known state-commissioned portrait to include the ruler's heir.
 By including the child, Cosimo wished to imply that his rule would bring stability to the duchy.
The Portrait of Bartolomeo Panciatichi is a painting by the Italian artist Agnolo di Cosimo, known as Bronzino, finished around 1540.
 It is housed in the Uffizi Gallery of Florence, Italy.