On the facade an inscription traces the construction of the church to the Queen of the Lombards, Theodolinda. The structure of the church is Romanesque in style. Roman Cologno, became due to its importance, a Christian parish church in the early Middle Ages. Most likely, Christian evangelization predated that of the Basilica of San Giovanni in Monza, to which the parish church of San Giuliano was always firmly linked. The parish church of San Giuliano was always proclaimed the "mother" of all the other churches in the vicinity. Text carved on the plaque above the entrance portal to the parish church: "Templum hoc Sancto Juliano martyri a pietate Teodolinda e Longobardorum regi-nae anno DIC conditum ab excidio bellica VIX defensum restauratum anno MDC dignitate olim vetustate nunc insigne. This temple [dedicated] to Saint Julian martyr by the devotion of Theodolinda queen of the Lombards [was] founded in the year DIC (599) [and] barely protected from war destruction. Once distinguished by dignity, now by age, [it was] restored in the year MDC (1600)".