The Pope wore three. It shouldn't be that much harder.
Suleiman the Magnificent wore four.
The Pope wore three. It shouldn't be that much harder.
Retaining Venice is possible, but Tuscany isn;t., Remember that Tuscany wwas independent principality merely ruled by a branch of the Habsburgs. A branch also ruled in Modena and in Parma (Maria Louise, until 1848). If Italy does unite, I can see them eying Venice, but perhaps a sound defeat will end their ambitions. Especially if Venice is well integrated. It'd make an excellent port for the Habsburgs,
Remember that after 1848 Tuscany was essentially an Austrian protectorate; in 1850 Leopold II agreed to an indefinite garrison of between 10,000 and 20,000 Hapsburg troops in Florence alone in order to guard his throne, and just months later he indefinitely dismissed the Tuscan parliament on the 'advice' of Franz Joseph and Schwarzenberg, and two years later, again on the advice of the Hapsburgs and their reactionary allies (Pope Pius IX, Ferdinand II of the Two Sicilies, Charles III of Parma, & Francis V of Modena) he revoked the 1848 constitution (which Leopold had actually supported).
Ultimately the Austrian troops were withdrawn in 1855, and the Piedmontese captured Florence easily in 1859 when the Tuscan people turned on the Hapsburgs.
However, if the Hapsburgs had stayed in Tuscany, coupled with no Second War of Italian Independence, and a more liberal/reformist Hapsburg policy, Tuscany could certainly stay under the Hapsburgs sphere, and likely would be finally brought into the fold at a later date.