The Three Jewels of Maraseri is a colloquial term for the great coastal cities of Matlisan, Sitadori and Deici. All three are prosperous centers of trade and culture. Matlisan recieves and sells the goods of the furthest east; Deici brings goods from the south and Sitadori is the gate of trade to Amallon and the west. Despite the distance between them (300 leagues at least) all three maintain fairly close ties and work towards mutual benefit. Between them they control most trade within the northern reaches of Maraseri.
This is not to say that relations are always smooth between the three; there have been skirmishes and wars occassionally over the two and a half centuries during which the three have been allies. Greater profits and mutual economic interests usually win out over military ambitions.
Every third year, the rulers of the three cities (the Councillor Prime of Matlisan, the Grand Duke of Sitadori, and the Exalted of Deici) gather in one city or another in council. The meeting takes place in a different city each year, rotating among them. On occassion, the host elects to hold the meeting within his or her territory, but not within the city itself.
The term 'Three Jewels of Maraseri' originates in a lengthy travelogue, in the form of a poem of a thousand stanzas. The celebrated Almeidan poet and traveller, Solva Sabo (1432-1505 AS) wrote the epic sometime between 1462 and 1465 AS., during a lengthy voyage along the shores of Maraseri.
Each city is also named for a jewel. Matlisan is the Ruby of Maraseri; Sitadori is the Sapphire; Deici the Emerald. The associated colour--red, green, or blue--is strongly associated with each city. Other epithets of the cities often arise from these associations. For example, Matlisan is sometimes called the Crimson City; Deici is the Emerald Harbour; and Sitadori the Azure Isle.