Photographic portrait · Dimitar Karastoyanov · Public domain · Wikimedia Commons Previous rulerBoris III1918–1943 R Next rulerRegency Council 1943–19441943–1944 S20th century · TsarSimeon II1943–1946Became tsar at six; regents governed until the republic was proclaimed.SourcesBulgarian Heraldry and Vexillology Society Royal Bulgarian Heraldry and Vexillology Society, historical heraldry overview, undated.Българско национално радио, Архивен фонд Референдумът и Народната република BNR archive, 8 September 2021. · 2021Official website of Simeon Saxe-Coburg-Gotha Симеон Сакскобургготски: 75 години PDF Biographical brochure for Simeon’s 75th birthday, hosted on kingsimeon.bg; publication date not stated. Photographic portrait · Dimitar Karastoyanov · Public domain · Wikimedia Commons Previous rulerBoris III1918–1943 R Next rulerRegency Council 1943–19441943–1944