Lithuanians called those endowed with the ability to predict the future, to read signs sent by the universe, to interpret dreams, to communicate with gods and the world of the dead, and to heal people and animals – the high priests (“žyniai” in Lithuanian, probably originating from the Lithuanian word žinoti – “to know”). To the pagan community, even to the rulers, the word of the high priests meant the word of gods, and anyone who disobeyed the high priest’s orders was threatened with death. The centre of the Baltic cult was in Prussia, in Nadruvia, – Rikojotas, better known as “Romovė” or “Romuva”. Here lived the chief priest known as “Krivis”. Alongside him, in a sacred place called “alkas”, there were more pagan priests, both male and female, called “vaidilutės” (English: priestesses), “vaidilos” (English: senior priests). This place was described in detail by Simon Grunau in the 16th century. The Bychowiec Chronicle tells about the priestess Birutė, who later became the wife of Kęstutis. Written sources also mention a shrine where the Cathedral Basilica now stands in Vilnius. According to a late 14th century bull of Pope Urban VI, in the 13th century there was a Thunder Temple, with a Thunder Idol in it and a twelve-step altar, where the holy fire burned. The contemporary ancient Baltic religious community “Romuva” believes that the altar of the temple is still in the crypts of the Cathedral.