These Greek elements penetrated India quite early as shown by the Hellenistic Pataliputra capital (3rd century BC) during the Maurya Era, but the influence became especially strong, particularly in northwestern India following the invasion of the Greco-Bactrians in 180 BC, with the establishment of the Indo-Greek kingdom in India. Architectural styles used Hellenistic decorative motifs such as fruit garland and scrolls. Stone palettes for aromatic oils representing purely Hellenistic themes such as a Nereid riding a Ketos sea monster are found.