From Greek tetra ( tettara ), four and pylon, door, entrance, (four doors). They also call it tetrapilon. The Romans called him jano in reference to the bifronte god Janus, that of the gates and of the month of January. These are ancient quadrifront monuments originating in the Hellenistic period with an arch-door on each side. They used to stand at the crossroads. I want to highlight the traticl arch of the Roman city of Capera (Cáparra) on the via la Plata caceres .
