Sadler-Grün performed on stage, often under the name Urany Verde, and made a tour of Germany. He usually performed in the role of either a queen or a princess, and sang soprano as well as baritone.
- Iwan Bloch. The Sexual Life of Our Time In Its Relations to Modern Civilization. London: Heinemann, 1908: 500.
- Bernd-Ulrich Hergemöller. “Sadler-Grün, Willibald von”. Mann für Mann: biographisches Lexikon zur Geschichte von Freundesliebe und mannmännlicher Sexualität im deutschen Sprachraum. 1, A - Ras. Münster [u.a.]: Lit-Verl, 2010: 602-3.
Grün is German for green, Verde is Spanish for green. Urany Verde is Green Uranian. Uranian is the anglicization of Ulrich's Urning.
I have found no mention indicating that Willibad survived the First World War.