This "Danish" in fact reflected local dialects; a standard language did not yet exist. But a certain dominance of Zealandic forms is visible already in the late Middle Ages: the administrative, ecclesiastical and commercial center of Denmark lay on Zealand (Roskilde, Copenhagen), and a Zealandic chancery style (inspired by German and Latin syntax) was developing.
Source: wiktionary
Here it seems natural to pay attention to some North-east Zealandic names ending in -rum, viz. Wigarum, AEsarum (and Niartherum ?).
Source: wiktionary
...the extent of the deflectional changes varies among the dialects, Jutish always having gone the furthest, Scanian always the most conservative, with Zealandic taking an intermediate position.
Source: wiktionary
In Zealandic Dutch ben- is the stem for the present tense for all persons except for 3SG (is).
Source: wiktionary
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