The county of Bentheim was in existence by c. 1050 AD, although little is known of its history before 1115. In that year, the county passed to Count Otto, of the House of Salm. His heir and daughter, Countess Sophia, married Dirk VI, Count of Holland, and they co-ruled the county until Dirk's death in 1157. Sophia died in 1176, and the title of count passed to her son Otto I. In 1263, Bentheim annexed the County of Tecklenburg, and over time various branches of the counts of Bentheim would annex and purchase various territories in Rheda, Steinfurt, and the Netherlands. In 1277, the County of Bentheim was partitioned into Bentheim-Bentheim (containing the County of Bentheim) and Bentheim-Tecklenburg (containing the County of Tecklenburg).