metrites

But by the description in the text, Marco appears to have comprehended the whole north-east of Tartary, to the north of the Changai mountains, under the general name of Bargu, in which he now includes Curza, mentioned separately at the commencement of the preceding Section, and where the situation of Bargu has been already more particularly described in a note. Metrites, Meclites, or Markaets.

Robert Kerr - A General History and Collection of Voyages and Travels — Volume 01 : Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time

After some time, Zingis went to war with the Su-Mongal or Tartars, slew their duke, and subjugated the nation; and he successively reduced the Merkats and Metrites to his growing dominion.

Robert Kerr - A General History and Collection of Voyages and Travels — Volume 01 : Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time

The Sumongalles, that is to say the watre Mongalles, whiche called them selues Tartares, of the floude Tartar whose neighbours thei are. The thirde people ware called Merchates, and the fourthe Metrites. There was no difference betwixte them eyther in body or language, but al aftre one sorte and facion.

Richard Hakluyt - The Principal Navigations, Voyages, Traffiques and Discoveries of the English Nation — Volume 06 : Madiera, the Canaries, Ancient Asia, Africa, etc.