Stari grad Jezerski nalazi se na oko četiri kilometra udaljenosti zapadno od Bosanske Otoke. Smješten je na dugačkoj kosi, koja se strmo obara u pitomu dolinu. Prvi put u historijskim izvorima spominje se 1278. godine. U građevinskom pogledu ovaj rad je vrlo interesantan kao predstavnik posebne vrste starih gradova, iz kojih su se kasnije razvile savršenije tvrđave. U sredini Jezerskog nlazila se visoka okrugla kula, čija debljina zidova iznosi 1,8 metara, a ulaz joj je uzdignut 4 metra iznad nivoa tla. Oko kule se uzdizdao čvrst i 7 metara visok zid u obliku četverokuta dužine 16 i širine 12 metara. Ovaj grad sazidan je prije pronalaska vatrenog oružja, što dokazuje okrugao oblik otvora u zidu , koji su služili za gađanje lukom i strijelom. Grad je u početku pripadao slobodnoj plemenskoj općini, a krajem XV stoljeća kao gospodari spominju se Nemčići. Godine 1563. grad je čuvala posada od 16 kraljevskih vojnika.
Pod osmansku vlast Jezerski je došao 1576. godine i uključen je u sastav Krupske kapetanije. Osmanske vlasti su pored starog grada izgradile drvenu džamiju i nekoliko zgradaq i sve to opasale novim bedemima. U grad je smještena vojna posada, kojom je zapovijedao dizdar potčinjen krupskom kapetanu. Ova posada se do polovine XVII stoljeća sastojala od 23 graničara, a onda je povećana na 30 graničara. U prvoj polovini XVIII stoljeća posada je udvostručena pa je brojala 60 ljudi, a tvrđava je poojačana s dva manja topa.
The old town Jezerski founds about 4 kilometers in the west of Otoka. Iti s settled on a long slope, which overturns into pleasant valley. In the source fot the first time Jezerski was mentioned in 1278. From construction sight this town is very interesting. It represents the special kind of old towns, which were improved in later period . In the middle of Jezerski was high rounded tower whose walls were 1.8 meteres wide. The entrence was 4 meters above the ground. Around the tower was firm and 7 meters high wall in shape of quadrangle (16 meters in length and 12 in width). This town was built before people made the first fire weapon and proves for this are circled hole sin the wall that were used for shooting the arrows out. At first this town belonged to a free noble municipality and by the end of the 15th century masters were Nemčićs. In 1563 crew of 16 Kings soldiers guarded the town.
It was part of Krupa Captaincy. Turkish authorities made a wooden mask and a few buildings and rounded all together with new ramparts. The military crew was settled in town and it was under command of Fortress Commander who has benn subjugated to Captain of Krupa. Until the middle of the 17th century this crew had 23 border guards and late rit increased to 30 border guards. In the first half of the 18th century the crew was doubled and had 60 men and the fortress got two smaller cannons.
Tekst i slike obradio: Igor Pečenković dipl.ecc.hot.
Izvori: JU „Zavod za zaštitu kulturnog naslijeđa Bihać“ popisni registar,“Stari gradovi Unsko-sanskog kantona“ Zavod za zaštitu kulturnog naslijeđa Bihać i Muzej Unsko-sanskog kantona,februar 2009, internet, http://old.kons.gov.ba/