 The two visited Gottfried Wilhelm Leibniz in France and John Collins in England together.Mohr returned to Denmark in 1681; he had dedicated "Euclides Danicus" to Christian V and hoped for a position in exchange, but was offered only a position as a shipyard supervisor, which he declined.He married Elizabeth von der Linde of Copenhagen on 19 July 1687, and soon after returned to Holland; their son, Peter Georg Mohrenthal, eventually settled in Dresden as a bookseller and publisher.