Denier - Otto IV and Otto V

Otto IV and Otto V ruled Brandenburg jointly for much of the late thirteenth century, a co-regency arrangement that was itself a product of the fragmented succession politics of the Ascanians following the death of John I in 1266. Joint issues of this kind — two rulers sharing a single coin type — were administratively convenient but chronologically awkward, which is precisely why the attribution window runs a full decade.

The Bahrf. 565 / Dann Br. 111 reference places this squarely within the Brandenburg denier series that preceded the region's adoption of heavier pfennig coinage in the following century.