Deposed, House of Wittelsbach, Infanta Maria de la Paz of Spain, Infante of Spain, King Otto of Greece, Kingdom of Greece, Prince Aldalbert of Bavaria, Prince Ludwig Ferdinand of Bavaria, Queen Isabella II of Spain
The continued inability of the royal couple to have children also raised the thorny issue of succession: the 1844 constitution insisted that Otto’s successor had to be Orthodox, but as the king was childless, the only possible heirs were his younger brothers, Prince Luitpold and Prince Adalbert.
The staunch Catholicism of the Wittelsbachs complicated matters, as Prince Luitpold refused to convert to the Greek Orthodox Church and Prince Adalbert married Infanta Amalia of Spain, the eleventh child and sixth daughter of Infante Francisco de Paula of Spain, younger brother of King Fernando VII of Spain, and his wife, Princess Luisa Carlota of Bourbon-Two Sicilies.
The sons of Prince Adalbert, and especially the eldest, Prince Ludwig Ferdinand, were now considered the most likely candidates, but due to the issue of religion, no definite arrangements were ever made.
Following his marriage to Infanta María de la Paz of Spain, Prince Ludwig Ferdinand was also created an Infante of Spain. Infanta María de la Paz of Spain was the third surviving daughter of Queen Isabella II and her husband Infante Francisco of Spain.
According to historians, the true biological father of Infanta Paz was the diplomat and politician Miguel Tenorio de Castilla (1818–1916), who was secretary of Queen Isabella II for several years.
It has been suggested that had Otto and Amalia borne an heir, the king would not have been overthrown, as succession was also a major unresolved question at the time. However, the Constitution of 1844 made provision for his succession by his two younger brothers and their descendants.
While Otto was visiting the Peloponnese in 1862 a new coup was launched and this time a Provisional Government was set up and summoned a National Convention.
Ambassadors of the Great Powers urged King Otto not to resist, and the king and queen took refuge on a British warship and returned to Bavaria aboard (the same way they had come to Greece), taking with them the Greek regalia which they had brought from Bavaria in 1832.
In 1861, a student named Aristeidis Dosios (son of politician Konstantinos Dosios) attempted to murder Queen Amalia and was openly hailed as a hero. His attempt, however, also prompted spontaneous feelings of monarchism and sympathy towards the royal couple among the Greek population
Otto died in the palace of the former bishops of Bamberg, Germany, and was buried in the Theatiner Church in Munich. During his retirement, he would still wear the Greek traditional uniform, nowadays worn only by the evzones (Presidential Guards).