Two portraits of Bishop Simon Michael Tadeusz Giedroyć have been preserved in the Samogitian Diocese Museum (Žemaičių vyskupystės muziejų). They are part of a larger collection of bishop portraits kept at the museum. Both portraits follow the convention of bishops' portraits from the 18th and 19th centuries, with prominent prominence of symbols of spiritual authority. They are characteristically influenced by realist painting, but despite their decorative form and references to the tradition of representational portraiture, their unsophisticated form indicates a rather local provenance.

Szymon Michał Tadeusz Giedroyć (1764-1844) was a Roman Catholic clergyman, bishop and theologian. He was born on 30 October 1764 near Vygotsk in Lithuania. He was educated at the seminary in Vornia. He was ordained a priest in 1787, and in the same year received his doctorate in theology at the Vilnius Academy. In 1789 he became a member of the Lithuanian Tribunal. In 1804 he was appointed coadjutor to Bishop Joseph Arnulf Giedroyć, although the Pope did not approve this choice until 1812. In the same year, Giedroyć accepted the episcopal sacrament, becoming suffragan of the Samogitian diocese. He held this post until 1838, when he became coadjutor of the Samogitian diocese, and after the death of Joseph Arnulf Giedroyć took over as its administrator. Despite the support of the Samogitian chapter, the Pope never approved his appointment as Ordinary of the diocese. He received numerous decorations including the Order of Saint Stanislaus and the Russian Order of Saint Vladimir Second Class and Order of Saint Anne Second Class. He died on 7 August 1844 in Alsėdžiai (Olsiadi). He was buried in the crypt of the Bishop's Cathedral in Vornia (now Varnių Šv. apaštalų Petro ir Pauliaus bažnyčia).

Portraits from the Museum of Samogitian Diocese (Žemaičių vyskupystės muziejų)

Portrait 1

Technique and material: oil on canvas
Stock no.: KAM BMr 427

Bust, figure turned slightly to the left, gaze directed at the viewer. The portrayed person has grey hair. He is dressed in a black mucet with rebate. On the chest the red and white ribbon of the Order of St Stanislaus and the pectoral cross are visible. To the left, the star of the order is visible, emphasising the high rank of the clergyman. The background of the portrait is brown and neutral, without additional decorative elements. In the lower part of the image is the inscription:
. Simon Michael Princeps GIEDROJC ab an[no] 1812 Ep[isco]pus. Adrami- | ensis Suffrag[anaeus] Samog[itiae] ab a[nno] 1838 Administrans Dioec[esim], Samog[itiae]. | anno 1844 mortus.

Portrait 2

Technique and material: oil on canvas
Bust, facing slightly to the left. The gaze is directed towards the viewer, grey hair. His left hand, bent at the elbow, holds a book, while his right hand, decorated with a ring, supports itself on a table containing books. He is dressed in a blue uniform jacket with a high collar. On his chest are three crosses, including a pectoral cross. In addition, the figure is girded with a red ribbon with yellow stripes, to which the Order of St Stanislaus, the Order of St Vladimir and the Order of St Anne are pinned. The star of the Order of St Stanislaus is visible on the chest. On the left side at breast level are three stars: at the top the Order of St. Vladimir, at the bottom the Order of St. Anne. A curtain decorated with a lambrequin is visible in the background. In the upper left part of the image is the family coat of arms Hippocentaurus under the crown, and below is the inscription:
. Princeps Simon Filius [...] | Gierojć Episcopus Samogintae | Natus A[nn]o 1764 Obist 1844.