Łomża Land (Polish: ''ziemia łomżyńska''), named after the town of

Łomża Łomża () is a city in north-eastern Poland, approximately to the north-east of Warsaw and west of Białystok. It is situated alongside the Narew river as part of the Podlaskie Voivodeship. It is the capital of Łomża County and has been the se ...

, was an administrative unit (

ziemia Land is a historical unit of administration in Poland and Ruthenia. In the Polish language, the term is not capitalized (''ziemia chełmińska'', Chelmno Land; not ''Ziemia Chełmińska''). All ''ziemias'' are named after main urban centers (o ...

) of the

Duchy of Masovia The Duchy of Masovia was a District duchy, district principality and a fiefdom of the Kingdom of Poland (1025–1385), Kingdom of Poland, existing during the Middle Ages. The state was centered in Mazovia in the northeastern Kingdom of Poland, a ...

, and after

Kingdom of Poland The Kingdom of Poland (; Latin: ''Regnum Poloniae'') was a monarchy in Central Europe during the Middle Ages, medieval period from 1025 until 1385. Background The West Slavs, West Slavic tribe of Polans (western), Polans who lived in what i ...

and the Polish–Lithuanian Commonwealth. It was part of

Masovian Voivodeship Masovian Voivodeship or Mazowieckie Province (, ) and any variation thereof, is a Voivodeships of Poland, voivodeship (province) in east-central Poland, containing Poland's capital Warsaw. Masovian Voivodeship has an area of and had a 2019 po ...

, and existed from the 14th century until the

Partitions of Poland The Partitions of Poland were three partition (politics), partitions of the Polish–Lithuanian Commonwealth that took place between 1772 and 1795, toward the end of the 18th century. They ended the existence of the state, resulting in the eli ...

. Łomża Land was the largest province of the historic region of

Mazovia Mazovia or Masovia ( ) is a historical region in mid-north-eastern Poland. It spans the North European Plain, roughly between Łódź and Białystok, with Warsaw being the largest city and Płock being the capital of the region . Throughout the ...

. The gord at Łomża was established some time in the 11th century, and by the 12th century, it became the seat of a

castellan A castellan, or constable, was the governor of a castle in medieval Europe. Its surrounding territory was referred to as the castellany. The word stems from . A castellan was almost always male, but could occasionally be female, as when, in 1 ...

. In 1379, Siemowit III, Duke of Masovia divided the

Duchy of Mazovia The Duchy of Masovia was a District duchy, district principality and a fiefdom of the Kingdom of Poland (1025–1385), Kingdom of Poland, existing during the Middle Ages. The state was centered in Mazovia in the northeastern Kingdom of Poland, a ...

between his sons, granting Łomża to

Janusz I of Warsaw Janusz I of Warsaw (pl: ''Janusz I warszawski''), also known as Janusz I the Old (pl: ''Janusz I Starszy'') (c. 1347/52 – 8 December 1429), was a Polish prince member of the House of Piast in the Dukes of Masovia, Masovian branch, from 1373/74 D ...

. The term Łomża Land (or Land of Łomża) was first used in documents from 1414. Until 1526, the region remained part of the Duchy of Mazovia, which was annexed into the Kingdom of Poland, and turned into

, in which it remained until the

. In the 16th century, Łomża Land had an area of 4260 sq. kilometers, and was divided into four

counties A county () is a geographic region of a country used for administrative or other purposesL. Brookes (ed.) '' Chambers Dictionary''. Edinburgh: Chambers Harrap Publishers Ltd, 2005. in some nations. The term is derived from the Old French denoti ...

: Łomża,

Kolno Kolno is a town in northeastern Poland, located in the Podlaskie Voivodeship, about northeast of Warsaw. It is the seat of Kolno County, and the seat of the smaller administrative district (gmina) called Gmina Kolno, Podlaskie Voivodeship, Gmin ...

Zambrów Zambrów is a town in northeastern Poland with 21,166 inhabitants (2020). It is the capital of Zambrów County. Situated in the Podlaskie Voivodeship (since 1999), previously in Łomża Voivodeship (1975–1998). History The name of the town co ...

and

Ostrołęka Ostrołęka (; ) is a small city in northeastern Poland on the Narew river, about northeast of Warsaw, with a population of 51,012 (2021) and an area of . It is the capital of both Ostrołęka County and Ostrołęka City County in the Masovian V ...

Sources

* Adolf Pawiński: Polska XVI wieku pod względem geograficzno-statystycznym. T. 5: Mazowsze. Warszawa: Księgarnia Gebethnera i Wolffa, 1895 Ziemias {{Poland-geo-stub