The Avis Order used a cross fleury vert on white, sometimes hollow, and this
symbol, very often in south and central western portuguese
municipal arms, was present on the “national” flag and arms from
1385 to 1433. António Martins, 19 Feb 1998
The portuguese branch of the Calatrava Order
(called Ordem Nova) was founded in 1162, based in
Coimbra. Later it went to Évora
(as Ordem de Milicia), and then to Avis — changing
its name to that of the town. António Martins, 19 Feb 1998