Born in Poland in 1724, he moved to Rome in the 1750s to study architecture, then came to Catania where he married the daughter of famous architect Francesco Battaglia.
Ittar was welcomed by Don Ignazio Paternò Castello, Prince of Biscari, who became his patron.
He constructed important works including the Porta Ferdinandea (1768), the piano di San Filippo (St. Philip’s Plan, now Piazza Giuseppe Mazzini) (1768-69) and the Chiesa della Santissima Trinità (Church of the Holy Trinity).
In 1785 he moved to Malta to serve the Order of St. John.
He died in 1790 in Malta.