Passage: Ferdinand's decision to ally with the Third Coalition against Napoleon in 1805 proved more damaging. In 1806, following decisive victories over the allied armies at Austerlitz and over the Neapolitans at Campo Tenese, Napoleon installed his brother, Joseph as King of Naples, he conferred the title "Prince of Naples" to be hereditary on his children and grandchildren. When Joseph was sent off to Spain two years later, he was replaced by Napoleon's sister Caroline and his brother-in-law Marshal Joachim Murat, as King of the Two Sicilies.

Question: What was the name of Napoleon's sister?
Caroline