As its evidence, a thing called the 'chopping board stone' remains in Matsuyama-jo Castle and even after a park was built at the castle site, it is said that even now the sound of sobbing can be heard (note that this kind of story exists for every castle, including the story called 'Okiku's well' as to Himeji-jo Castle).
その証拠として松山城には「まな板石」なる物が残され、城址公園となった今でもすすり泣く声が聞こえるという（但し、姫路城の「御菊井戸」など、城郭にはこの手の話がついてまわることは考慮せねばなるまい）。