I found the motto Spes mea Christus above the door of Plewlands House an historic house in South Queensferry near Edinburgh. Directly below it are the initials of the husband and wife for whom the house was built:- Samuel Wilson and Anna Ponton. This is an example of a 'marriage lintel', something that was quite common in Lowland Scottish houses of that period, as of course, were religious sentiments such as the one above it.
We have come across spes before; it simply means hope, and the motto means Christ (is) my hope.
