The crosses probably have their origin in the shield of the noble family Persijn. The knight Jan Persijn was lord of Amstelledamme (Amsterdam) from 1280 to 1282. In the escutcheons of Dordrecht and Delft, two other cities in Holland, the pale refers to water. In analogy with this, the black pale in the escutcheon of Amsterdam would refer to the river Amstel. Both the colours and the crosses are also found in the escutcheons of two towns near Amsterdam: the village of Ouder-Amstel on the banks of the river Amstel to the southeast, and Nieuwer-Amstel (now the suburb Amstelveen) to the southwest. Both villages were also the property of the Persijn family.