Virtus non stemma is Latin

Latin

Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 for "Valor, not garland". This is the Duke of Westminster

Duke of Westminster

The title Duke of Westminster was created by Queen Victoria in 1874 and bestowed upon Hugh Grosvenor, 3rd Marquess of Westminster. The current holder of the title is Gerald Grosvenor, 6th Duke of Westminster....

's motto at his stately home in Eaton

Eaton Hall (Cheshire)

Eaton Hall is the country house of the Duke of Westminster. It is set within a large estate south of the village of Eccleston, in Cheshire, England . The house is surrounded by formal gardens, parkland, farmland and woodland. The estate covers an area of about .The first substantial house was...

. The motto means, less literally: Courage, not pomp. The Duke also has many stately homes with the same motto. It is the motto of Grosvenor Rowing Club

Grosvenor Rowing Club

Grosvenor Rowing Club is based on the Groves in Chester. It rows on the River Dee and has around 30 km of rowable river at its disposal.The club colours are blue and gold, the blades and boats being blue and orange.-History:...

 and also used to be the motto of Harrow County School for Boys where it was usually translated as 'Worth, not Birth'.

The Latin words can also be translated as "Virtue, not pedigree". An expansion of the phrase used in some heraldry documents, Nobilitatis virtus non stemma, means: "Virtue, not pedigree, is the mark of nobility".