Short answers, pulled from the story.
Ferdinand I of the Two Sicilies was born on the 12th of January 1751 as the third son of King Charles VII of Naples. He became King of Naples as Ferdinand IV and King of Sicily as Ferdinand III in 1759, and proclaimed the unified Kingdom of the Two Sicilies on the 12th of December 1816, reigning until his death on the 4th of January 1825.
Ferdinand was first deposed for six months in 1799 when the revolutionary Parthenopean Republic was established in Naples with French support. He was deposed a second time in 1806 when Napoleon, following his victory at Austerlitz, invaded Naples and installed his brother Joseph Bonaparte as king.
Ferdinand fled Naples on the 23rd of December 1798 aboard Horatio Nelson's ship. A severe storm struck during the voyage, and his six-year-old son Prince Alberto died of exhaustion at sea, dying in the arms of Emma, Lady Hamilton.
Bernardo Tanucci was the Tuscan statesman who led the regency council formed when Ferdinand became king at age eight in 1759. An ambitious man who wanted to keep power for himself, Tanucci deliberately neglected Ferdinand's education and encouraged the young king's idleness and devotion to outdoor sports.
After General Guglielmo Pepe led a military revolt in July 1820, Ferdinand was forced to sign a constitution modelled on the Spanish Constitution of 1812. He swore twice to uphold it, then travelled to the Congress of Laibach in 1821 and repudiated both oaths in letters to European sovereigns, inviting an Austrian army to march into Naples and crush the liberals. The Neapolitan forces were defeated at the Battle of Rieti on the 7th of March 1821.
Ferdinand has been portrayed in three notable productions: the 1941 film That Hamilton Woman directed by Alexander Korda, with Luis Alberni in the role; the 1999 Italian film Ferdinando and Carolina directed by Lina Wertmuller, with Sergio Assisi, Adriano Pantaleo, and Mario Scaccia playing the king at different ages; and the 2004 film Luisa Sanfelice directed by Paolo and Vittorio Taviani, with Emilio Solfrizzi.