between 4 september 1238 and 18 july 1242, barnim i married firstly with marianna (d. 27 june 1252), whose parentage is disputed: she was either identified as a daughter of king eric x of sweden, or a member of the house of ascania as daughter of either count albert ii of weimar-orlamünde, count henry i of anhalt or albert i, duke of saxony. modern historiography considers that her origins are unknown. they had one daughter: