Pound (mass)
Portuguese libra and arrátel

The Portuguese unit that corresponds to the pounds of different nations is the arrátel, equivalent to 16 ounces of Colonha, a variant of the Cologne standard. This arrátel was introduced in 1499 by Manuel I, king of Portugal. Based on an evaluation of bronze nesting weight piles distributed by Manuel I to different towns, the arrátel of Manuel I has been estimated to be of 457.8 g (16.15 oz). In the early 19th century, the arrátel was evaluated at 459 g (16.2 oz).

In the 15th century, the arrátel was of 14 ounces of Colonha or 400.6 g (14.13 oz). The Portuguese libra was the same as 2 arráteis. There were also arráteis of 12.5 and 13 ounces and libras of 15 and 16 ounces. The Troyes or Tria standard was also used.
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