In the Late La Tène Age, in the 1st century BC, the acropolis of the Celtic oppidum was located on Bratislava Castle hill. Between 2008 and 2014, archaeological research brought the discovery of rare Celtic-Roman architecture built for Celtic nobility. A pavement of a late-Republican type, a so-called opus signinum with a floral carpet motif, was discovered directly beneath the courtyard of the palace. Similar types of pavements from this period have only previously been found around the Mediterranean. A total of seven Celtic-Roman buildings were found on the northern terrace of the Castle and under the 18th-century...