Late medieval depictions of a female saint, typically equipped with a spindle and spinning, and with rats either on the thread, on the saint or in the surroundings, are known from the Swedish churches of Film, Forssa (vanished), Harg, Kaga, Njutånger as well as possibly Viksta, and Hattula in Finland.

Similar depictions are also known from Germany, including on an altarpiece in the monastery of Adelberg, Baden-Württemberg under the name Cutubilla.

[10][11] Possibly, a combination of the two misunderstandings created the saint: the name was taken from Columba while the legend and patronage from Gertrude of Nivelles.

[13] A manuscript from the 16th century found in Linköping (Sweden) contains two prayers directed to Kakwkylla (using that name) for protection against rats and mice.

[14] From these prayers it can also be deduced that the cult was sanctioned (at least locally) by the church, since they contain descriptions of the priest leading the mass in her honour and displaying a statue of her.

[15] It is not known for how long the cult of Kakwkylla endured; in general the Reformation, begun in 1527 in Sweden, led to the end of the veneration of saints.