LTStraipsnyje pirmą kartą nuosekliai apžvelgiama Suvainiškio Šv. apaštalo Jokūbo XVIII a. 9-ąjį dešimtmetį pastatytos senosios medinės ir XIX a. 7-ąjį dešimtmetį sumūrytos dabartinės bažnyčios dekoro istorija ir pristatomas bei istoriniu, meniniu, ikonografiniu, tipologiniu ir dar kitais aspektais įvertinamas jos dailės paveldas. Remiantis literatūros ir šaltinių duomenimis bei apžiūra vietoje paeiliui aptariama, analizuojama, įvertinama: keliais etapais vykusi puošybos kaita, iš senosios šventovės paveldėtas meninis inventorius ir dabartinei bažnyčiai sukurtas dekoras. Istoriografiniu, formaliuoju, lyginamuoju ir kitais pagal poreikį taikomais metodais analizuojama meninė įranga (altoriai, sakykla, vargonų prospektas, parapetų apdaila), kai kurie baldai (krikštykla, klausyklos ir kt.), altorių ir altorėlių paveikslai, skulptūros, kiti nekilnojamieji ir kilnojamieji meniniai objektai. Absoliuti jų dauguma – šventovės interjero puošmenos. Zakristijos inventorius (liturginiai indai ir rūbai) nepristatomas, išimtis tepadaryta senoms fundatorių dovanotoms dalmatikoms.
ENThe paper provides, for the first time, a detailed and analytical presentation of the decor history of the Suvainiškis Church of Saint James the Apostle, both the old wooden church funded by the spouses Antanas Kamarauskas (Antony Komorowski) and Antanina Marikonytė-Kamarauskienė (Antonina z Morykoniów Komorowska) in 1782 and intended for the Regular Canons Penitentiary, and the current brick church built in 1863. It also describes its artistic interior equipment and decoration items that have survived in situ. The research was based on (rather few) direct sources and contextual literature, comparative materials, historical sources, and on-site inspection. During the research, new historical facts, some creation dates of artistic heritage items and the names of their creators have been uncovered. Chapter 1 contains knowledge about the artistic and other inventory of the old Suvainiškis church; it describes its iconographic decor program showing that the Regular Canons focused on the worship of Jesus Christ and the honouring of the Blessed Virgin Mary and some saints. Chapter 2 talks about the development of the current church decor from the 1860s to the beginning of the 20th century and its iconographic program repeating the program of the previous church (even though since 1832 the Suvainiškis church no longer belonged to the order of the Regular Canons and, later, a new and newly decorated church was built, the old traditions of piety were still cherished there).The third chapter of the paper analyses the heritage of the old church: the organ facade (believed to be the work of Latvian craftsmen) decorated with rococo carvings, sculptures of the Crucified by provincial sculptors, an empire style baptismal font, the old painting of the apostle James the Elder, works of applied art, and two dalmatics (just like the facade of the organ, they are decorated with the coats of arms of the church’s funders). Chapter 4 presents the decor created for the current church: a pulpit contemporary with the building and the wooden parapets of the choir and gallery, altars built in 1894, altar paintings of the Sacred Heart of Jesus, the Blessed Virgin Mary of Immaculate Conception, and Saint James attributed to the artist Nikodemas Silvanavičius (Nikodem Sylwanowicz), and two neo-rococo processional altars: one made before 1886 and attributed to the workshop of Fabijonas Ostrovskis (Fabian Ostrowski) in Vilnius, and the second manufactured later, possibly by his student Kazimieras Kriščiukaitis. The artistic heritage of the Suvainiškis church is important not only on a local scale. It is a significant addition to the research on the spirituality and artistic heritage of the Regular Canons Penitentiary and, besides, it testifies to the contribution of the funders of the church and adds some highlights to the Lithuanian art history.