The Roman colony of Barcino was founded on top of a small hill, just over 16 feet above sea level: Mont Taber. Although the hill wasn’t very high, the topography of the ancient Roman city was defined by it. The streets that lead directly towards the second area of the Roman city wall (4^th century) had a prominent slope at the end.  In medieval times the wall lost its defensive function and a lot of sections were demolished to open up the streets. Many of these streets were renamed with Baixada (which means slope in Catalan). For instance we still find today Baixada de Viladecols, Baixada de Caçadors (hunters), Baixada dels Lleons (lions), or Baixada de Santa Eulàlia. Where today Carrer Llibreteria is, it used to be Baixada de la Presó (prison).