LT2019 m. birželio–rugpjūčio mėnesiais KPIP atliko detaliuosius tyrimus Reformatų skvero teritorijoje Vilniuje, kurioje vykdyti Reformatų sodo ir atkūrimo projekto darbai. 1582 m. Eustachijus Valavičius sklypą aptariamoje vietovėje padovanojo evangelikų reformatų špitolei ir kapinėms. 1625–1626 m. sinodo sąskaitose minima, kad statoma kapinių tvora turi būti ne žemesnė nei 3 sieksniai. Dėl nesutarimų su katalikais 1640 m. Lenkijos karalius ir Lietuvos didysis kunigaikštis Vladislovas Vaza pasirašė dekretą, kuriuo evangelikai reformatai buvo iškelti už Vilniaus miesto sienos ribų. Anksčiau dovanotame sklype jie įkūrė savo kapines bei iki 1651 m. pastatė pirmąją medinę bažnytėlę. Per karą su Maskva ji sudegė, kaip ir kiti teritorijos pastatai. 1668 m. teismo komisija konstatavo, kad reformatų valdos pastatai visiškai sugriauti. [...]. [Iš teksto, p. 341]
ENIn 2019, four trenches (a total of 479.3 m2) were excavated at the site of planned leach lines (soakaways) as well as storm drains and water supply networks in Reformatų Square. A cultural layer at least 1.2–5.1 m thick and dating to the 15th – late 20th centuries, was recorded. Trenches 1 and 2 identified the site of a ditch filled in the second half of the 18th century. The fill contained construction rubble, which could allow one to assert that some of the soil scattered after the construction of the buildings on the nearby property of the Reformed Church could have ended up at this site. The lower horizons of the cultural layer formed during the 15th–17th centuries. Foundation fragments from outbuildings dating to the second half of the 17th – second half of the 18th century were unearthed. Two levels of 18th-century stone paving were recorded beside them. These constructions are connected with the service area of the Reformed Church’s property. A first half of the 17th-century storage pit with a large quantity of finds and animal bones was excavated in trench 3. The lower horizons of the cultural layer formed in the 16th and the second half of the 17th-18th centuries. Fragments of a masonry semi-basement of a second half of the 18th-century service building were unearthed with stone paving in a supposed inner room. In an effort to check the entire thickness of the cultural layer, 24 boreholes were made and the result showed that sterile soil at the site of trenches 1 and 2 lie at a depth of at least about 3.5–6 m.The investigation yielded a large collection of 14th–20th-century finds: sherds of household pottery, fragments of various stove tiles, a casting form for the production of ornaments, a crossbow bolt head, a pin, some Napoleonic army gear, decorated pipes, musket flintlock flints, ornament fragments, small medals, seals, and 142 coins.