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Cross Emblems Before B, C, 2000
Petrie dates the cross as an emblem to about -3000, at Susa and in India — the Mohenjo-daro cross, SA 4 — set off by a double border in SA 1 to 4. That, he argues, makes the contemporary Egyptian signs, A 6, 7, emblems rather than mechanical line-work; Cilicia and Aleppo, A 8, 9, fill the gap between.
By -2600 Crete began elaborating it, SD; the plain equilateral cross of the Knossos shrine, SF 4, about 2300 B.C., is, he says, exactly the well-known Greek cross of Christian times.