A Maundy scene from an Anglo-Saxon manuscript: monks washing feet and a king giving alms, in an 11th-century Psalter (BL Harley 603, f.66v) #MaundyThursday

Maundy Thursday was also once known in English as 'Sheer Thursday', from Old Norse skærr, 'bright, clear, pure'. The name may derive from the association of the day with various kinds of ritual cleansing: confession, foot-washing, and stripping of altars https://quod.lib.umich.edu/cgi/m/mec/med-idx?type=id&id=MED39895&egs=all&egdisplay=compact

Christ washing the disciples' feet, from an Anglo-Saxon carving from Wirksworth, Derbyshire http://www.wirksworth.org.uk/A44-STON.htm 

The Last Supper, in a wonderfully well-preserved medieval reredos from Somerton, Oxfordshire:

An old (and noisy!) Maundy Thursday tradition from Kendal https://archive.org/stream/englishfolkrhyme00nortuoft#page/196/mode/1up

Christ washing St Peter's feet, as an angel waits attendance with a towel, from an 11th-century English Psalter http://www.bl.uk/manuscripts/FullDisplay.aspx?ref=Cotton_MS_Tiberius_C_VI

The Agony in the Garden, from a 14th-century Book of Hours. Christ is alone, the apostles sleeping, but in the darkness behind him a gallery of medieval faces - kings and queens and ordinary people - keeps vigil with him through the night.

http://www.bl.uk/manuscripts/FullDisplay.aspx?index=11&ref=Yates_Thompson_MS_13 f. 118v