| Notes |
- Gen.X
He was the master of an immense fortune which was enlarged still further, immediately after his wife came into succession of the princely Wisniowiecki estates.
He was heir to Kraslaw, Kombul, Indryca and Isnaudy. In conjunction with his mother he acquired the Pustyn estate in the Vilna district on 28th October 1739.
He purchased the Courland estates of Grenzhof, Matuliszki, Alt and Neu-Born together with Warnowicz with the village of Zarosle.
He acquired the Newlany estate in the Drysiena district.
In 1771 he held half the security of the Smorgonia estate owned by Prince Karol Radziwill. He was heir to the Kalnicy demesne in the Lipowiecki province of the Ukraine.
In 1736 he was delegate from Livonia to the 'Peacemaker' Parliament and he was still a member in 1738. After his father he was Starost of Livonia, being the 4th member of the family in succession to hold that position.
He resigned his life appointment as Starost in favour of his son, Jozef Wincenty. Before he became Starost of Livonia and Dyneburg he was Starost of Grawerowski but without a castle.
The Royal Domain which was established during the period of the last 150 to 200 years of the Republic, comprising the whole province of Livonia, remained in the hands of the Platers for the whole of that period. In 1758 he received the Order of St Alexander Newski from the Czarina of Russia.
He was a Colonel of a squadron of cuirassiers and frequently appeared with that rank.
He was Castellan of Trock which he retained until his death and with this office became the 5th Senator of the family His main seat was at Kraslaw where he built a magnificent palace on the heights above the Dzwina River, surrounded by a beautiful park.
In 1752 he erected in the market place a Town Hall with a tower and shops. The shops were occupied by tradesmen brought in from Warsaw and Germany. Soon after, Kraslaw became widely known for the manufacture of carpets , velvet, damask, playing cards, side-arms, firearms, carriages jewelry and goods of goldsmiths.
Four times a year the famous market drew merchants from afar. Exports were made to to other provinces of Poland and to Russia.
The industry of Kraslaw was completely destroyed after the partitions of the Republic.
In 1755 to 1767 he built the magnificent temple named St Ludwik for the King and it was appointed by the Parliament as the Cathedral for the Livonian bishops. (It is still in an excellent state of preservation in the year 2002).
He endowed the Baltyn estate for its maintenance. He built a synagogue for the Jews.
In 1759 he built a great library structure of 3 floors.
The ground floor was used as a summer residence for for his family and the whole of the upper 2 floors housed his library of 20,000 volumes which was widely renowned for the selection of works and resources.
The wife of Konstanty Ludwik brought in from Rome the relics of St Donat and installed them in a tomb-chapel of the Cathedral. Also in the church, from her endowment, was a beautiful canopy made from the tent of King Michal Wisniowiecki.
In 1789 she founded a hospital under the care of the Sisters of Mercy specially brought in for this purpose.
In 1770, Konstanty Ludwik introduced his home-made money, a facility which had full acceptance as a means of exchange in Kraslaw and its environs for many years.
They tokens of tin bearing an impression of the Plater coat-of-arms.
In 1787, a specially cast bell was placed in the belfry of the church and it was named "Konstanty Ludwik."
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