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

Łomża Łomża (), in English known as Lomza, is a city in north-eastern Poland, approximately 150 kilometers (90 miles) to the north-east of Warsaw and west of Białystok. It is situated alongside the Narew river as part of the Podlaskie Voivodeship ...

, was an administrative unit (

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

) of both the

Kingdom of Poland The Kingdom of Poland ( pl, Królestwo Polskie; Latin: ''Regnum Poloniae'') was a state in Central Europe. It may refer to: Historical political entities * Kingdom of Poland, a kingdom existing from 1025 to 1031 * Kingdom of Poland, a kingdom exi ...

and the

Polish–Lithuanian Commonwealth The Polish–Lithuanian Commonwealth, formally known as the Kingdom of Poland and the Grand Duchy of Lithuania, and, after 1791, as the Commonwealth of Poland, was a bi- confederal state, sometimes called a federation, of Poland and Lithuania ru ...

. It was part of

Masovian Voivodeship The Masovian Voivodeship, also known as the Mazovia Province ( pl, województwo mazowieckie ) is a voivodeship (province) in east-central Poland, with its capital located in the city of Warsaw, which also serves as the capital of the country. Th ...

, and existed from the 14th century until the Partitions of Poland. Łomża Land was the largest province of the historic region of

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

. The gord at Łomża was established some time in the 11th century, and by the 12th century, it became the seat of a castellan. In 1379,

Siemowit III, Duke of Masovia Siemowit III of Masovia (his name also rendered Ziemowit; – 1381) was a prince of Masovia and a co-regent (with his brother Casimir I of Warsaw) of the lands of Warsaw, Czersk, Rawa, Gostynin and other parts of Masovia. Life Siemowit ...

divided the

Duchy of Mazovia 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, and d ...

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 Masovian branch, from 1373/74 Duke of Warsaw an ...

. 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 Partitions of Poland. 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 purposesChambers Dictionary, L. Brookes (ed.), 2005, Chambers Harrap Publishers Ltd, Edinburgh in certain modern nations. The term is derived from the Old French ...

: Łomża, Kolno,

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 ...

and

Ostrołęka , image_flag = POL Ostrołęka flag.svg , image_shield = POL Ostrołęka COA.svg , pushpin_map = Poland Masovian Voivodeship#Poland , pushpin_label_position = bottom , subdivision_type = Country , subdivision_name = , subdivision_type1 = ...

Sources

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