An equivoque is a poem that can be read in two different ways. This one appeared in The Weekly Pacquet of Advice from Rome in 1679. Protestants were to read each line straight across, Catholics down each column:

The Jesuit’s Double-Faced Creed

I hold for sound faith What England’s church allows
What Rome’s faith saith My conscience disavows
Where the king’s head The flock can take no shame
The flock’s misled Who hold the Pope supreme
Where th’altar’s dress’d The worship’s scarce divine
The people’s bless’d Whose table’s bread and wine
He’s but an ass Who their communion flies
Who shuns the Mass Is Catholic and wise.