|Covid-19|The first documented reference, to the city of Gdańsk, is made.
Saint Adalbert of Prague is sent to Prussia, by Boleslaus I of Poland.
Samuil of Bulgaria is crowned Tsar by Pope Gregory V.
Trondheim, Norway is founded by King Olav Tryggvason. This will function as the main city and capital of Norway, until Bergen is founded in 1070.
In Spain, the Muslim de facto ruler of al-Andalus, al-Mansur, with the support of the Christian Portuguese knights, sacks one of Christendom's holiest sites of pilgrimage, Santiago de Compostella. On their way, they sack the cities of Zamora and Leon.
In Southern Italy, Smaragdos and Peter lead a rebellion against Byzantine rule.
Alan III, Duke of Brittany
Rhys ap Tewdwr
Bertha of Milan, member of the Obertenghi dynasty.
April 23 – Saint Adalbert of Prague (martyred)
Emperor Taizong of Song
Géza, Grand Prince of the Hungarians
Waldrada of Tuscany, dogaressa of Venice
Teresa Ansúrez, Leonese regent.
Year 997 (CMXCVII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.