Question: Who stars in the romantic film based on an 18th century Italian adventurer?

Context paragraphs:
Cetti's warbler: Cetti's warbler , "Cettia cetti", is an Old World warbler.  It is a small, brown bush-warbler which breeds in southern and central Europe, north-west Africa and east southern temperate Asia as far as Afghanistan and north-west Pakistan.  The bird is named after the 18th century Italian zoologist, Francesco Cetti.  This species is very difficult to see because of its skulking habits.

Michele Mari: Michele Mari (born 26 December 1955) is an Italian novelist, short story writer, academic critic and poet.  The son of a Milanese industrial designer and artist, Enzo Mari, Mari teaches Italian literature at the Università Statale di Milano; he is considered one of the leading experts of 18th Century Italian literature.

English landscape garden: The English landscape garden, also called English landscape park or simply the English garden (French: "Jardin à l'anglaise" , Italian: "Giardino all'inglese" , German: "Englischer Landschaftsgarten" , Portuguese: "Jardim inglês" , Spanish: "Jardín inglés" ), is a style of "landscape" garden which emerged in England in the early 18th century, and spread across Europe, replacing the more formal, symmetrical "jardin à la française" of the 17th century as the principal gardening style of Europe.  The English garden presented an idealized view of nature.  It drew inspiration from paintings of landscapes by Claude Lorrain and Nicolas Poussin, and, in the Anglo-Chinese garden, from the classic Chinese gardens of the East, which had recently been described by European travellers.  The English garden usually included a lake, sweeps of gently rolling lawns set against groves of trees, and recreations of classical temples, Gothic ruins, bridges, and other picturesque architecture, designed to recreate an idyllic pastoral landscape.  The work of Lancelot "Capability" Brown was particularly influential.  By the end of the 18th century the English garden was being imitated by the French landscape garden, and as far away as St. Petersburg, Russia, in Pavlovsk, the gardens of the future Emperor Paul.  It also had a major influence on the form of the public parks and gardens which appeared around the world in the 19th century.

The Count of Cagliostro: The Count of Cagliostro (German: Der Graf von Cagliostro) is a 1920 Austrian silent horror film directed by Reinhold Schünzel and starring Schünzel, Anita Berber and Conrad Veidt.  It depicts the life of the eighteenth century Italian adventurer Alessandro Cagliostro.  The film's art direction was by Oscar Werndorff.

Romantic music: Romantic music is a period of Western classical music that began in the late 18th or early 19th century.  It is related to Romanticism, the European artistic and literary movement that arose in the second half of the 18th century, and Romantic music in particular dominated the Romantic movement in Germany.

Bartolomeo Vecchione: Bartolomeo Vecchione is a late 18th century Italian architect of the late-Baroque or Rococo period, active in and around Naples.

Giacomo Casanova: Giacomo Girolamo Casanova (] or ] ; 2 April 1725 – 4 June 1798) was an Italian adventurer and author from the Republic of Venice.  His autobiography, "Histoire de ma vie" ("Story of My Life"), is regarded as one of the most authentic sources of the customs and norms of European social life during the 18th century.

Carlo Magini: Carlo Magini (1720–1806) was an Italian painter of the late-Baroque period and one of the most original of the 18th century Italian still life artists.

Italian Neoclassical and 19th-century art: Italian Neoclassical and 19th-century art refers to painting and the plastic arts made in Italy or by Italian artists in the Neoclassical period (late 18th – c. mid-19th centuries) and the 19th century.  In the late 18th and 19th centuries, Italy went through a great deal of political, social, economic and cultural changes and reforms, including several foreign invasions, most notably by Napoleon Bonaparte and the Austrians, several revolutions in 1848 and the turbulent Risorgimento, which resulted in the Italian unification and the Kingdom of Italy.  Thus, Italian art in the late 18th and throughout the 19th century went through a series of minor and major changes in style.

Casanova (2005 film): Casanova is a 2005 American romantic film directed by Lasse Hallström starring Heath Ledger and loosely based on the life of Giacomo Casanova.

Supporting paragraphs: Casanova (2005 film) Giacomo Casanova
Answer: Heath Ledger