There is no reason to doubt that some such visit was made about the year 315, when the death of Maximin Daza left Constantine supreme.
This treaty was never ratified, and four years later General Hilarion Daza, who had succeeded Dr Frias as president in 1876, demanded as the price of Bolivia's consent that a tax of 10 cents per quintal should be paid on all nitrates exported from the country, further declaring that, unless this levy was paid, nitrates in the hands of the exporters would be seized by the Bolivian government.
General Daza, who should have cooperated with Buendia, turned back, on receiving news of the Peruvian defeat, and led the Bolivian troops to Tacna in a hasty and somewhat disorderly retreat.
(Or Dagnus - perhaps to be identified with Maximinus Daza, joint emperor (with Galerius) in the East 305-311, and sole emperor 311-313.) Round this small nucleus of possibility, however, a vast mass of legendary matter gradually collected.