Tantallon Castle was established in the later fourteenth century by William Douglas, first earl of Douglas, on a promontory above the Firth of Forth. Rather than surrounding the entire site with masonry, its builders relied on sea cliffs on three sides and raised a massive red-sandstone curtain wall across the landward approach. Towers, a gatehouse, halls, chambers, kitchens, stores, and service courts created a fortified noble residence whose scale announced Douglas authority in southeastern Scotland.

After the Douglas inheritance divided, Tantallon became the principal stronghold of the earls of Angus, known as the Red Douglases. The family alternately served and challenged the Scottish Crown, and the castle became a political base as much as a military refuge. James IV besieged Tantallon in 1491 during a confrontation with Archibald Douglas, fifth earl of Angus. Royal artillery demonstrated the growing importance of cannon, but reconciliation and shifting alliances preserved the castle and the family's regional influence.

A more destructive conflict followed when Archibald Douglas, sixth earl of Angus, opposed James V. The king invested Tantallon in 1528 with heavy guns brought from other royal fortresses. Bombardment damaged the walls but did not force an immediate breach, and the garrison held until political circumstances changed. James eventually acquired the castle and ordered repairs that adapted its medieval defenses to artillery. The episode made Tantallon a celebrated example of a great lordly house resisting increasingly centralized royal power.

The castle returned to the Angus branch and continued to serve as residence, prison, and coastal stronghold. During the Wars of the Three Kingdoms, a Royalist force used Tantallon to threaten communications along the Forth. In 1651 troops serving the English Commonwealth under General George Monck subjected the castle to sustained cannon fire. The garrison surrendered, and the battered towers and curtain wall were left militarily unusable. Tantallon was not rebuilt as a major residence after that siege.

Later owners valued the dramatic ruin within the East Lothian landscape, while antiquarians, artists, and visitors recorded its association with the Douglases and the Scottish crown. Modern guardianship has stabilized the high masonry without disguising the effects of artillery, weather, and abandonment. Tantallon's significance lies in the union of architecture and geography: its single great wall converted a cliff-bound headland into a fortress, while its repeated sieges show the changing relationship among aristocratic power, royal government, gunpowder warfare, and control of the exposed Firth of Forth strategic coast.