Agnes of Poitou and Andrew I of Hungary meet to negotiate about the border territory of Burgenland.

Agnes of Poitou was the queen of Germany from 1043 and empress of the Holy Roman Empire from 1046 until 1056 as the wife of Emperor Henry III. From 1056 to 1061, she ruled the Holy Roman Empire as regent during the minority of their son Henry IV.

Andrew I the White or the Catholic was King of Hungary from 1046 to 1060. He descended from a younger branch of the Árpád dynasty. After he spent fifteen years in exile, an extensive revolt by the pagan Hungarians enabled him to take the throne from King Peter Orseolo. He strengthened the position of Catholicism in the Kingdom of Hungary and successfully defended its independence against the Holy Roman Empire.

Burgenland is the easternmost and least populous state of Austria. It consists of two statutory cities and seven rural districts, with a total of 171 municipalities. It is 166 km (103 mi) long from north to south but much narrower from west to east. The region is part of the Centrope Project. The name of Burgenland was invented/coined in 1922, after its territories became part of Austria. The population of Burgenland as of 1 January 2024 is 301,951. Burgenland's capital is Eisenstadt.

September 20 is the 263rd day of the year in the Gregorian calendar; 102 days remain until the end of the year.