It grows in Zagnańsk near Kielce in the Świętokrzyskie Mountains

Its age, previously estimated at up to 1200 years, has recently been established to be 650–670 years, with a corer used to extract a sample for a ring count. An accurate count is impossible, as Bartek's interior has hollowed with age.

The tree now measures 30 meters in height, trunk circumference is at a height of 1.30 m - 9.85 m and 13.4 m from the ground, crown spread of 20 mx 40 m, 720 m³ crown hood, pierśnica 3.14 m [2 ]. The thickness of the whole tree is about 72 m³, roundwood thickness of the whole tree about 65 cubic meters, including a trunk main - approximately 46 m³

1829 -. Then the estimated age is 800 years. It has 15 main branches of considerable thickness and 16 secondary.

1860 - Examination Bartek and preparation metrics 1906 -fire a barn - destruction branche the eastern, damage

to other branches. Infections: czyreń oak, sulfur hub 1920 - the first restoration work, removal of dry branches,

filling the trunk cavity with stones and lime mortar (8m3), dead pieces of stem bark layers masked, set the fence sztachetowego with a diameter of 7 m, displaying nesting boxes for birds

- 1927 - "one lower limb, reportedly broke off during quiet under its own weight ..."( is also known that in the main branch was struck by lightning and broke it at the base of)

- 1927 - "one lower limb, reportedly broke off during quiet under its own weight ..."( is also known that in the main branch was struck by lightning and broke it at the base of)

1934 - A jury chaired by Professor Wladyslaw Szafer Bartek considered to be "the most magnificent tree in Poland

1952 - Oak Bart obtains the status of natural monument 1953 - gusty winds broke the side branch (3.5 m3 of

roundwood), the introduction of fungicides, complement plombu using cement (1 tonne), set two supports at the southern branch

1956 - set props larch 1984 - gale broke off one of the branches

1991 - (June 3) lightning strike ignites a broken upper limb and secured. Melts "seal" of plastics. Arises also called. lightning strip on the trunk main. Putting the northern Konar, remove deadwood (4 mp), wound protection and Imprexem Lacbalsamm trees, removal of the concrete seal of Konar south, setting the filter and the grid, three bridle July ocieniających Bartek from the west, cut two in July on the south side Bartek.

1999 - installation of lightning protection to protect against lightning- 2005 - installation of three additional steel supports

- 2009 - Chemical analysis of soil at a depth of 10 - 30 cm shows a deficiency of magnesium (Mg) and oxygen!, Execution tomographic studies. Bartek condition evaluated as bad, requiring immediate assistance!

Trunk decay has become a serious problem: healthy tissue thickness does not exceed 20 cm, and in many places is only 5 cm. Oak began to tilt dangerously under the weight of one of the branches.

Bartek on the trunk, from the south-east are suspended two figures of Christ crucified, probably cast iron in local factories. On one of the figures shown is the year 1853. According to oral tradition, they were to be placed in memory of hanging on Bartek two officers of the January uprising. Another version of the oral administration of claims that a cast had to be suspended to commemorate the victory of Sobieski at Vienna, and another was placed on a memorial Bartek expiration cholera epidemic in 1853

presentation prepared by: Magdalena Raczyńska Paulina Manerowska