9 dated entries naming House of Hohenzollern, drawn from 9 separate years between 1279 CE and 1913 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.
1279John I, German nobleman (House of Hohenzollern) (died 1300)source
1289May 24 – Frederick V, German nobleman (House of Hohenzollern)source
14th century
1309October 6 – Frederick VII, German nobleman (House of Hohenzollern)source
15th century
1418November 21 – Brandenburg–Pomeranian conflict: In Germany, the Treaty of Ueckermünde is signed by the Dukes of Pomerania-Stettin (Otto II and Casimir V) with the Dukes of Mecklenburg-Schwerin (Albert V), Mecklenburg-Werle (Lord Christopher) and Mecklenburg-Stargard (John III) to ally against the Electorate of Brandenburg, ruled by the House of Hohenzollern elector Friedrich Isource
16th century
1554October 21 – The Plassenburg castle in Bavaria, residence of the ruling House of Hohenzollern in the Principality of Ansbach, is destroyed during the Second Margrave War.source
1598January 8 – In Berlin, Joachim Frederich of the House of Hohenzollern becomes the new Elector of Brandenburg upon the death of his father, Johann Georg von Brandenburg.source
17th century
1686December 22 – Frederick William, Elector of Brandenburg and Duke of Prussia, head of the House of Hohenzollern, enters into an alliance with the Holy Roman Empire.source
19th century
187016 July – In response to Bismarck's refusal to cede parts of the Rhineland to Emperor Napoleon III of France, the near succession of a Hohenzollern to the Spanish throne, and the Ems telegram, France declares war on Prussia, beginning the Franco-Prussian War.source
20th century
1913May 24 – Princess Victoria Louise of Prussia marries Prince Ernest Augustus of Hanover in Berlin, ending the decades-long rift between the Houses of Hohenzollern and Hanover and marking the last great gathering of European sovereigns.source