Margareta Slots or Margareta Cabiljau (died 1669) was the royal mistress of king Gustav II Adolf of Sweden and the mother of Gustav of Vasaborg.

Margareta Slots was the daughter of the Dutch merchant Abraham Cabiljau. Slots met Gustav in Pskov

Pskov

Pskov is an ancient city and the administrative center of Pskov Oblast, Russia, located in the northwest of Russia about east from the Estonian border, on the Velikaya River. Population: -Early history:...

 in 1615. She was at the time married to Andries Sessandes, who fell in battle soon after. In 1616, she and Gustav had a son; Gustav acknowledged her son and granted her an allowance. She married paper

Paper

Paper is a thin material mainly used for writing upon, printing upon, drawing or for packaging. It is produced by pressing together moist fibers, typically cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets....

 maker Arendt Slots and then gunpowder

Gunpowder

Gunpowder, also known since in the late 19th century as black powder, was the first chemical explosive and the only one known until the mid 1800s. It is a mixture of sulfur, charcoal, and potassium nitrate - with the sulfur and charcoal acting as fuels, while the saltpeter works as an oxidizer...

 maker Jacob Trellow, and was given the estate Benhamn in Uppland

Uppland

Uppland is a historical province or landskap on the eastern coast of Sweden, just north of Stockholm, the capital. It borders Södermanland, Västmanland and Gästrikland. It is also bounded by lake Mälaren and the Baltic sea...

, were she lived with her husbands, often asking for favours from the king.

In 1625, she was involved in an incident. The bailiff

Bailiff

A bailiff is a governor or custodian ; a legal officer to whom some degree of authority, care or jurisdiction is committed...

 Jacob Galle threatened her with confiscation after she had prevented her tenants to take part in a construction work. She then visited Galle, asked if he had not heard of the priviligies granted her by the monarch and struck him with her stick, after which Galle was beaten by her servants. Galle died of the injuries and she was accused for his murder, but there is no mention of any punishment of her. Reportedly, she met Gustav only once (1630) since their relationship ended.