Historically, artisans carried forward design elements from wood in their rock-cut temples: skilled craftsmen carved rock to imitate timber texture, grain, and structure. The earliest cave temples include the Bhaja Caves, the Karla Caves, the Bedse Caves, the Kanheri Caves, and some of the Ajanta Caves. Relics found in these caves suggest a connection between the religious and the commercial. Buddhist missionaries are known to have accompanied traders on the busy international trading routes through India. Some of the more sumptuous cave temples, commissioned by wealthy traders, included pillars, arches, and elaborate facades. They were made during the period when maritime trade boomed between the Roman Empire and south-east Asia.