The Spanish, Italian and Portuguese Old Masters all painted on hand-woven patterned linen canvases. This 'first layer' has been given only sporadic study by art historians. I started deciphering the weaving draft of El Greco’s 'The Burial of the Count of Orgaz', in 2016. It recently culminated in authentic, hand-woven reconstructions of historic canvases.
a postcard from the Museum of Évora shows a tablecloth with a pattern... oil on panel, 1500, Altar piece from the Sé Cathedral in Évora
oil on panel, 1500, Altar piece from the Sé Cathedral in Évora note the pattern in the tablecloth !