Convert yard (spanish) to roman league

The vara of Burgos, 0.8359 m, was Spain's standard yard from 1801 until the metre replaced it; it divided into 3 pies (feet), 36 pulgadas (inches), 432 líneas and 5,184 puntos, and a paso (pace) was 5/3 of a vara. The vara travelled to the colonies and was fixed differently in each: 0.838 m in Mexico, 0.866 m in Argentina, and 33⅓ inches (0.847 m) in Texas and California, where old land grants are still described in varas.

Roman lengths were built on the foot (pes, about 29.6 cm): 16 digiti (finger widths) or 4 palmi (palm widths) made a foot, 1½ feet a cubit, 5 feet a passus (a double step), 10 feet a pertica (perch) and 120 feet an actus, the length of a furrow. Longer distances counted in stadia of 625 feet and in mille passuum, a thousand double steps or 5,000 feet, which is where the word mile comes from; the Gallic leuga was 1½ Roman miles. Milestones along the Roman roads were set one mille passuum apart.