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In page Languages of Europe:

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Several dozen manual languages exist across Europe, with the most widespread sign language family being the Francosign languages, with its languages found in countries from Iberia to the Balkans and the Baltics. Accurate historical information of sign and tactile languages is difficult to come by, with folk histories noting the existence signing communities across Europe hundreds of years ago. British Sign Language (BSL) and French Sign Language (LSF) are probably the oldest confirmed, continuously used sign languages. Alongside German Sign Language (DGS) according to Ethnologue, these three have the most numbers of signers, though very few institutions take appropriate statistics on contemporary signing populations, making legitimate data hard to find.[citation needed]