Dudley left England in July 1605, by Calais. His lover and cousin
Elizabeth Southwell accompanied him,
cross-dressing as a
page. She was a daughter of Sir
Robert Southwell and Lady
Elizabeth Howard, who was a granddaughter of
Charles Howard, 1st Earl of Nottingham, Dudley's uncle. The couple declared that they had converted to
Catholicism. Dudley married Elizabeth Southwell in
Lyon in 1606, after they had received a papal dispensation from
Pope Paul V because they were blood relatives, and they first settled in
Florence. In English law, this marriage was
bigamous as he was still married to Lady Alice (a marriage not recognised by the Pope as it had taken place in the
Church of England). He began to use his father's title of Earl of Leicester and his uncle's title of Earl of Warwick. , one of Dudley's Medici patrons Dudley designed and built warships for the arsenal of Livorno and became a naval advisor to
Ferdinand I, Grand Duke of Tuscany, of the
Medici family. He received an annuity of 2,000
ducats. In 1608, Dudley convinced the Duke to send the privateer galleon
Santa Lucia Buonaventura to Guiana and northern Brazil in the only
tentative Italian colonization in the Americas, known as the
Thornton expedition.
Attempts at reconciliation James I revoked Dudley's travel licence in 1607. When he ordered Dudley to return home to provide for his deserted wife and family, Dudley refused. He was then declared an
outlaw, and his estate was confiscated. He continued contacts with the English court through Sir
Thomas Chaloner, who was now a chamberlain to
Henry Frederick, Prince of Wales. He corresponded with the young Prince on the subjects of
navigation and
shipbuilding, and in 1611 tried to broker a marriage between him and
Caterina, daughter of Duke Ferdinand. Meanwhile, Henry Frederick had taken a fancy to Kenilworth Castle, calling it "the most noble and magnificent thing in the midland parts of this realm". Wanting it, he was willing to buy it from Dudley and agreed in 1611 to pay £14,500, with Dudley to hold the office of
constable of the castle for his lifetime. When Henry died in 1612, only £3,000 had been paid, and it is unclear whether Dudley ever received it. The new Prince of Wales,
Charles, then took possession of the castle but failed to pay the balance owing. In 1621, he got an
Act of Parliament allowing Dudley's wife to sell the estate to him for £4,000. at
Lilleshall, Shropshire. In 1618, James I granted the Earldoms of Leicester and Warwick to others (respectively
Lord Lisle and
Lord Rich). In 1620, Dudley convinced Grand Duchess
Maria Magdalena, wife of the new duke
Cosimo II, to ask her brother, the Emperor
Ferdinand II, to recognize his claim to his grandfather's title of
Duke of Northumberland. Dudley succeeded on 9 March 1620, and James I severed all negotiations for conciliation.
Later years became wife of
Charles Talbot, Duke of Shrewsbury in 1705; granddaughter of Robert Dudley In addition to shipbuilding, Dudley was busy with many projects in Tuscany, including the
Livorno's
breakwater and harbour fortifications, draining local swamps, and building a palace in the heart of Florence. He also designed new galleys, and he wrote his memoirs of navigation and seamanship between 1610 and 1620. Later, Dudley incorporated his notes into six volumes of ''
Dell'Arcano del Mare (The Secret of the Sea
), self-published in 1646–1647. He also wrote a Maritime Directory'' as a manual for the Tuscan Navy but it was never published. In 1631, his wife Elizabeth died the day after giving birth to her last child. Several of their 13 children married into the Italian nobility. In 1644, King
Charles I created Dudley's second wife Alice
Duchess of Dudley for life and recognized Dudley's legitimacy but did not restore his titles and estate. Robert Dudley died on 6 September 1649 outside Florence in Villa Rinieri (now Villa Corsini a Castello). He was buried at San Pancrazio in Florence.
Posthumous legal disputes over his titles and estates A son of Dudley was Carlo Dudley, titular Duke of Northumberland who was the father of Maria Cristina Dudley, the second wife of Marquis Andrea Paleotti; they were the parents of
Adelhida Paleotti who married
Charles Talbot, 1st Duke of Shrewsbury; there was no issue of this marriage. Despite the marriages of Dudley descendants, "No Dudleys in the line male now remained to carry on the name. After the third generation they became extinct in Italy". In 1660, after the
Restoration, Lady Alice, Dudley's second wife (regarded in English law as his legitimate widow), petitioned King
Charles II to have her title as Duchess of Northumberland recognised (she had the English title of
Duchess of Dudley); and for her daughters, Lady Katherine Leveson and Lady Anne Holborne, to be given the rank and precedence of a duchess's daughters. However, the King kept the title in the gift of the Crown, and bestowed it instead on his illegitimate son,
George Fitzroy. Dudley bequeathed his estate to
Ferdinando II de' Medici, Grand Duke of Tuscany. His collection of scientific instruments is on display at the
Museo Galileo (Galileo Museum, formerly the Institute and Museum of the History of Science) in Florence. His grandson Ulderico
di Carpegna (son of Teresa Dudley, Duchess of
Castiglione del Lago) became in 1685
Prince of the Holy Roman Empire and Sovereign Prince of
Scavolino (part of the Sovereign
County of Carpegna) and his descendants reigned until 1807 (
de jure until 1814). ==''Dell'Arcano del Mare''==