Background
She was the mother of the illegitimate son of Charles X, count Gustaf Carlson. Allertz was the daughter of the wealthy Stockholm city councillor Claes Allerts (d 1650) and the successful wheat merchant Britta Jacobsdotter.
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Marta Allertz
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The year of her death is unknown: she is last confirmed alive in 1665, and was surely dead by 1677, when her death estate was listed. Allertz and Charles had a relationship after his return from Germany in 1646. In 1647 they had a son, Gustaf Carlson.
He spent his first three years with his mother, was in 1650 entrusted to Magnus Gabriel De la Gardie and ennobled in 1674.
In contrast to other mistresses of Swedish royalty, Allertz did not marry directly after the relationship was broken. Her mother was granted several sums in the capacity of her guardian.
