The Alpine county that grew from the bailiffs of Tyrol Castle near Meran into the state controlling the Brenner and Reschen passes; ruled by its own counts, then the House of Gorizia, then from 1363 by the Habsburgs as a distinct hereditary land with its own estates.
Ceded to Duke Rudolf IV of Austria in 1363 on the death of Meinhard III, last of the Gorizia-Tyrol line, and thereafter a Habsburg hereditary land (repeatedly under its own cadet lines, 1406-1490 and 1564-1665); the princely county ended as an imperial estate with the dissolution of the Holy Roman Empire in 1806, having been ceded to Bavaria at the Peace of Pressburg in December 1805 (returned to Austria 1814).
The only dedicated English-language history-and-country book on Tyrol found on Open Library; its opening chapters narrate the counts of Tyrol from c.1140 through Margaret Maultasch and the 1363 cession, and were read in full text for this record.
Standard scholarly frame for how Tyrol functioned as a hereditary land, including the separate Tyrolean cadet lines; used as the umbrella context, not the polity-specific source.