Definition - "if you seek his monument, look around"
It took 35 years to complete London's magnificent St. Paul's Cathedral. When its architect, Sir Christopher Wren, died twelve years later in 1723, he was entombed inside, under a simple slab of black marble. Wren's son placed a dedication nearby, which contains the words "Lector, si monumentum requiris, circumspice" ("Reader, if you seek a monument, look around you"). The phrase is generally used to describe a person's legacy - and can be taken to mean that what we leave behind (including intangible things like relationships) best represents our life.
There are others who have not fared so well in terms of having their name placed in dictionaries in ways that relate to work on old English cathedrals. Sir Edmund Beckett, the first Baron Grimthorpe, is the source of the word grimthorpe ("to remodel an ancient building without proper knowledge or care to retain its original quality and character"), after his attempted restoration of St. Albans cathedral was viewed as subpar.
Among the authors and printers whose portraits decorated these walls, no portrait of Caxton would be observed, for the simple reason that no authentic portrait had been handed down to us; the well-known momumental inscription to be found elsewhere was, therefore, most appropriate in this place, "Si Monumentum Requiris, circumspice."
— The Huddersfield Chronicle and West Yorkshire Advertiser, 2 Jul. 1877