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.
Caravaggio painted 'The Crucifixion of Saint Andrew' on a canvas in linen with this pattern. Its the 'first layer'... handwoven by Helena Loermans @Lab O