First systematic excavations, that actually were only information surveys, were taken in 1958, within the pale of archaeological site of Porolissum, where performed its works a large group of researchers, led by regretted professor Mihail Macrea. Of his commission and modest funds provided by the Museum of Zalău, they began the excavations at the castra, excavations that were conceived to unfold several years and would receive a greater ampleness. But, unfortunately, the excavations were limited to 1958, to what they could do then, not to be resumed. Otherwise, excavations from Porolissum were stopped the following year, because the same reasons of deformed and arbitrary historical photics. After 36 years, the researches were resumed and continued, through a collaboration between Institute of Archaeology and Art History in Cluj-Napoca and Museum of History and Art in Zalău.Gh. Bot, Despre castrul și garnizoana romană de la Tihău, published in 1974, in IMCD, p. 429-440
