(b. Varciano, near Narni, Umbria, c. 1570 ; d. Warsaw, May 4, 1623), was a t first choirmaster to the German College a t Rome, and afterwards for a time a t the Vatican Basilica. In 1603 he accepted an invitation from the music-loving King of Poland, Sigismund I I I ., to preside over the Royal Chapel a t Warsaw, where he remained till his death. The Royal Chapel a t Warsaw was then one of the best appointed in Europe, as Sigismund, fanatically anxious to re-establish the strictest Romanism in his dominions even a t the cost of civil war, spared neither trouble nor expense in the engagement of the best Italian singers and musicians to restore the Roman form of worship to its former splendour. He had previously engaged Luca Marenzio2 as his choirmaster a t w hat was then the magnificent salary of 1000 ducats. To Pacelli Sigismund showed the special distinction of erecting to him a monument w ith bust and laudatory epitaph s in one of the chapels of the cathedral of Warsaw. Pacelli's publications are one book of psalms and motets, a 8 (Rome, 1597); one book, ditto, a 4 (1599); Sacra" cantiones, a 5-20 (Venice, 1608); one book of madrigals, a 4 (Venice, 1601). The volume of 1608 no doubt shows the brilliant style of polychoric music th a t was then so much in favour a t Warsaw as elsewhere. The 1 Promptuarium ' of Schadaeus, 1611, contains ten motets of Pacelli a 6-8, and Bodenschatz's ' Florilegium,' 1621, 3 a 8. Ambros gives high praise to a motet for eight voices, ' Factum est silentium,' in Constantini's collection, 1614. J . R . M .