Accubation was introduced in Rome after the first Punic War (264-241 BC). In Greece accubation was unknown at the time of the Homeric poems (cf. Od. i. 145 ἑξείης ἕζοντο κατὰ κλισμούς τε θρόνους τε, XV. 134 ἑζέσθην δ᾽ ἄρ᾽ ἔπειτα κατὰ κλισμούς τε θρόνους τε), but afterwards the Greeks and Romans adopted this Oriental fashion and lay very nearly flat on their breasts while taking their meals, or in a semi-sitting posture supported on the left elbow.
Source: wiktionary