On the ninth of September, 1888, an unusual event occurred in the princely house of Wittelsbach. Maximilian Joseph, the head of the ducal line of Vorpfalz-Zweibrücken-Birkenfeld, and his wife Ludovica (Louise), daughter of King Maximilian First of Bavaria and his second wife, Caroline of Baden, celebrated on that day their diamond wedding, both bride and groom having been barely twenty years old at the time of their marriage.