In 1590, Mercator suffered a stroke that left him unable to speak and paralyzed his left side, making it extremely difficult for him to continue his work.
Pada tahun 1590, Mercator terserang stroke dan akibatnya ia tidak bisa berbicara dan tubuh bagian kirinya lumpuh, sehingga sangat sulit baginya untuk melanjutkan pekerjaan itu.