In some parts of Spain, at least as early as the 14th century – ?, a unit of mass = 4 libra, about 1.185 kilograms. See the medieval law.

In Guatemala, 16th century, a unit of mass = 4 libra, about 1.84 kg. It was used in weighing tribute paid in fish by the Indians to the Spanish.¹

1. Dan Stanislawski.
Guatemala Villages of the 16th Century.

From a 16th-century list (Archive of the Indies, legajo #128), tribute paid by the town of Agalteca: ". ...los viernes y sabados y dias de Cuaresma cada dia un arrelde de pescado..."


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