Kildrummy Castle was established in the thirteenth century as a major stronghold of the earls of Mar. Its broad, shield-shaped enclosure, multiple towers, gatehouse, chapel, and great hall were unusually ambitious for northeast Scotland. Positioned above routes through the River Don valley, the castle controlled access between lowland districts and the central Highlands. The design offered both military strength and a setting for aristocratic government. Royal attention, including a visit by Edward I of England in 1296, confirms Kildrummy's importance during the crisis over the Scottish succession.

The castle became a focal point in the Wars of Scottish Independence. In 1306 supporters and relatives of Robert Bruce sought refuge there after his defeat at Methven. An English army besieged Kildrummy, and later accounts say fire was set in the grain store after betrayal from within. The garrison surrendered; Bruce's brother Neil was captured and executed, while several women connected with the Bruce cause were also taken. The episode made the fortress a symbol of both resistance and the severe reprisals used to break rebellion.

Kildrummy was repaired and again contested in 1335, during renewed war over the Scottish crown. Christina Bruce, Robert's sister, directed its defense against David of Strathbogie until a loyalist army relieved the siege at the Battle of Culblean. Control later returned to the earls of Mar, and residential buildings were rebuilt within the damaged defenses. Like many large castles, Kildrummy supported a household of officials, servants, craftspeople, and retainers whose daily work was essential to the exercise of regional lordship.

The castle's fortunes declined as owners preferred more comfortable residences and political power became less dependent on holding a single fortress. John Erskine, earl of Mar, was a leader of the Jacobite rising of 1715. Although the rising is more directly associated with his gathering at Braemar, the forfeiture of his estates affected Kildrummy and reinforced its abandonment. Roofs and floors disappeared, vegetation spread through the enclosure, and local stone reuse contributed to the ruinous condition that later antiquarians recorded.

Conservation under state care stabilized the surviving towers, curtain walls, chapel, and hall. Archaeological investigation has clarified the sophisticated plan and the sequence of destruction and rebuilding. Kildrummy is especially significant because its architecture and documented sieges reveal the scale of medieval noble power in northern Scotland. The monument also preserves the memory of Christina Bruce's successful defense, an episode that complicates assumptions about warfare and gender. Its ruins connect thirteenth-century castle building, the struggle for Scottish independence, later aristocratic decline, and the modern study of medieval military architecture.