I am struggling to see enough to base a search on, so it really depends on someone recognising the portrait to home in on a country or region. It is certainly NOT an English long cross penny, or indeed any English coin. At a guess I would suspect a French bishopric or regional issue.
This coin was attributed to Godfrey by K. Giesen (reference) which refutes the previous attribution to Hildesheim (mint) under either duc Ordulf, or Count Udo II. This places the issuing of this denier in a Frisian mint, before the issuing of two types with the legend MERE CIVITAS.
Edit: And what I thought was a crown with a cross, is a building such as a church with a cross on top (as seen with many 12th-13th c. denars from Germany etc)
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