Denier Bracteate - Mieszko III the Old Gniezno or Kalisz mint

Mieszko III ruled Greater Poland twice — expelled by his own nobility in 1177, he spent decades in intermittent exile before recovering his position, a political instability that almost certainly disrupted mint operations and accounts for the irregular survival of his bracteate issues. The Gniezno and Kalisz attribution remains unresolved because neither mint has yielded die-linked archaeological evidence sufficient to separate the two.

At 0.19 g, these were among the thinnest coins struck in medieval Poland — bracteate production itself was a regional adaptation that sacrificed durability for silver economy, and most surviving examples are bent, cracked, or pierced from use as dress ornaments.