Civilization developed in Ethiopia. It was adjacent to the Red Sea. It is considered the oldest Christian civilization on earth. It began to take from around 1000 BCE. King Solomon, an Israeli King, and the Queen of Sheba were semites, or ethnic Jews. They lived in Syria, but they fled down across the Red Sea and formed this kingdom. They conquered Kush. They built a civilization with advanced agriculture. They were rich with luxury goods such as ivory, gold, spices, ebony, and animal skins. Frankincense and Myrrh also derived from here, which means that the three kings in the Christian faith may have come from this kingdom. It was successful due to its placement on the Mediterranean trade route to India. They were traders. They traded with Mediterraneans, Egyptians, and Indians. In 330 CE, they became a Christian kingdom. In the early 600s, Islam came to this kingdom, but they ended up ignoring them. By the end of the 500s, this kingdom was declining as it moved away from international trade and moved inland. However, in the 1100s, the Muslims began moving into this kingdom, starting a holy war in which this kingdom was at a disadvantage due to internal instability.