 Ferdinand returned in command of his brother's fleet but en route was blown off-course and spent four days in Kinsale in Ireland before reaching his destination.With the death of his grandfather Maximilian I and the accession of his now 19-year-old brother, Charles V, to title of Holy Roman Emperor in 1519, Ferdinand was entrusted with the government of the Austrian hereditary lands, roughly modern-day Austria and Slovenia.He was Archduke of Austria from 1521 to 1564.