"Cofiwch Dryweryn" ("Remember Tryweryn") is a motto referring to the drowning of Capel Celyn in 1965. It urges Welsh speakers to remember the destruction of a Welsh-speaking community and to safeguard the language. The most famous instance of this motto is a graffito on the wall of a ruined stone cottage by the A487 at Llanrhystud, outside Aberystwyth which has come to be regarded as a "national landmark". Meic Stephens claimed to have been the first to paint the wall in the 1960s, with the slogan "Cofiwch Tryweryn" ("sic", without the initial soft mutation and therefore grammatically incorrect). Since then, a number of people have repainted the wall, and the word "Tryweryn" has been corrected to "Dryweryn".