It is not too fanciful to say that the world owes a huge debt of gratitude to Francis I, King of France for Leonardo's Notebooks, or at least some of them.

Francesco Melzi was an Italian aristocrat. His family took the name from their home town, Melzo near Milan (Francesco has a street named after him).

John Evelyn visited Amboise in 1644.

In 1494 Leonardo da Vinci started working for Ludovico Sforza, the duke of Milan.

Dendrologists, who study the growth patterns and structures of trees, say that Leonardo's Rule of Trees is spot on.

On 24 February 1848 news came from Paris that King Louis-Philippe had abdicated.

On 18 February 1478, George, duke of Clarence was murdered in the Tower of London on the orders of his brother Edward IV, king of England. Families!

Biographies have been written about Louise of Savoy and her children Marguerite of Angoulème and Francis I but few, if any, point out their cruel sides.