Once known as Belus or Belos, the river is mentioned by Isidore of Seville.[5] According to the legend, this is where glass-making was invented. Tacitus also mentions glassmaking at the Belus. Pliny the Elder (Natural History, 5.19), using the name 'Pacida', mentions that the river flowed from Lake Cendevia (now below Mount Carmel) for 5 miles (8.0 km) to the sea near "Ptolemais Ace" (Acre, Israel), and that it was celebrated for its vitreous sands. The name is based on Baal.[6]