Death of ר׳ יצחק מאיר אלתר Rotenberg R. YIẒḤAK MEʾIR ALTER of Gur.

כ״ג באדר ה׳תרכ״ו23rd of Adar, AM 5626

https://thisjewish.day/event/5626-12-23-yizhak-death