Cadet of a reigning German dynasty, Prince Rainer was the head of the House of Saxe-Coburg and Gotha-Koháry branch of the House of Wettin, heir in the female line of one of the oldest and wealthiest families of the Hungarian nobility.
Prince Rainer, a member of the German royal family, held the position of head of the Saxe-Coburg and Gotha-Koháry branch of the Wettin dynasty. He was also an heir in the female line of one of the most ancient and affluent families within the Hungarian nobility.