The last-founded of the four Crusader states, built up around a prolonged siege of the Levantine port of Tripoli begun by Raymond of Saint-Gilles (Raymond IV of Toulouse) and completed by his successors of the Toulousain line.
Survived as a coastal remnant after the loss of Jerusalem in 1187, but fell to the Mamluk Sultan Qalawun in 1289, one of the last Crusader footholds on the Levantine mainland before Acre (1291).
The atlas holds 6 border frames for County of Tripoli — the shape you scrub through changes in 1102 · 1172 · 1195 · 1240 · 1250 · 1269.
The standard scholarly monograph specifically on the County of Tripoli under its founding Toulousain dynasty (in French; no verified English-language polity-specific monograph found on Open Library).