Prince Aloys Franz de Paula Maria, known in English as Prince Louis was an Austrian politician and member of the House of Liechtenstein. He was a deputy in the Austrian Imperial Council from 1878 to 1889 and 1891 to 1911. From 1910 to 1918 he chaired the Christian Social Party, in 1912 he was appointed to the House of Lords. His commitment to social reforms in the spirit of the "Workers' Pope" Leo XIII and his social encyclical Rerum novarum earned him the nickname "Red Prince".

The House of Liechtenstein, from which the principality takes its name, is the family which reigns by hereditary right over the principality of Liechtenstein. Only dynastic members of the family are eligible to inherit the throne. The dynasty's membership, rights and responsibilities are defined by a law of the family, which is enforced by the reigning prince and may be altered by vote among the family's dynasts, but which may not be altered by the Government or Parliament of Liechtenstein.