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It's less than a week since the latest controversial visit by Spanish king Felipe VI to Catalonia, with its protest banner. It's only two days since a Belgian court denied automatic extradition for Spanish rapper Valtònyc to serve a sentence for, among other charges, insulting the monarch in his lyrics and postponed its final decision until September.

Now, this Wednesday, a republican advert has appeared in Barcelona's plaça Urquinaona. Instead of quoting Valtònyc, however, it quotes another poet from a little further away in time and geography. For its republican message, this poster turns to the most classic of English classics.

The yellow loop has become a symbol of support for the Catalan pro-independence politicians held in pre-trial detention for months now. Here it's inverted, like a noose, over the Catalan translation of Hotspur's line "if we live, we live to tread on kings", from William Shakespeare's Henry IV, Part 1. If that message were rapped over a beat in today's Spain, it's unclear how the justice system might see it.

The poster has no signature beyond that of the quote's author.