The Church of Saint James the Greater in Nepomuk is a parish church located in Plzeňský kraj, Czech Republic. Originally built in the mid-12th century by Cistercian monks from the nearby monastery of Pomuk, it underwent significant architectural transformation into Gothic style at the end of the 13th century. This historical monument stands out for its religious significance and role as a fortress, reflecting its multifaceted history and architectural evolution over centuries.

The church's origins date back to when Bohemia was part of the Holy Roman Empire, a period marked by significant religious and political changes. The initial construction in the mid-12th century laid the foundation for what would become an important religious site. By the late 13th century, it had been completely rebuilt into Gothic style, featuring a basilica with three naves. This transformation coincided with a broader period of architectural innovation across Europe.

Architecturally, the Church of Saint James the Greater began as a single-nave structure and evolved into a Gothic basilica by the late 13th century. The church features a presbytery on its eastern façade, ending in a polygonal shape that forms twelve sides with six external buttresses. A notable addition was a wooden sacristy and bell tower constructed at the end of the 15th century, later replaced by baroque structures due to deterioration.

Throughout its history, the church has experienced significant events and changes in ownership. During the Hussite Wars in the early 15th century, it suffered damage but continued as an important religious site. In a dramatic turn of events in 1580, Ondřej ze Šternberka destroyed much of the church's interior during iconoclastic actions. The Šternberk family played a significant role in its history, both as benefactors and adversaries.

The church also served a defensive purpose, functioning as a fortress with protective walls and a moat to provide refuge to locals during times of danger. This dual role is evident in surviving architectural elements such as the nárožní půlválcová bašta (corner half-round bastion) on its western side.

In 1746, a significant fire led to the construction of a new bell tower between 1772 and 1780. However, by 1786, under Emperor Joseph II's rule, the church was closed, and its assets were auctioned off. It later served as a military storehouse before undergoing restoration in the mid-19th century, funded by notable figures including Emperor Ferdinand V.

Today, the Church of Saint James the Greater stands as a testament to its rich history and architectural evolution. Despite periods of neglect and damage, it has been restored multiple times, preserving its historical significance. Visitors can explore its unique blend of Gothic and baroque elements, reflecting centuries of cultural and religious influences. The church's dual role as both a place of worship and a fortress adds depth to its historical narrative, making it a compelling site for those interested in history and architecture. Its proximity to the prominent St. John Nepomucene church further enhances its appeal, offering insights into the region's ecclesiastical heritage.