The counts of Falkenstein are known above all from their register, the Codex Falkensteinensis, written in 1166 by canons of Herrenchiemsee at the castle of Neuburg near Vagen, when Count Siboto IV set out on Barbarossa's Italian campaign and wanted his young sons' inheritance secured.
It pictures four castles: Neuburg on the Mangfall, Falkenstein above the Inn near Flintsbach, Hartmannsberg near the Chiemsee and Hernstein in Lower Austria. Their core lands lie in the Inn valley above Rosenheim and in the valley of the Grosse Vils, with lands from the Mangfall to the South Tyrol and Lower Austria. It also records Siboto's secret letter to a ministerialis ordering harm to an enemy.
Who he is
- Name
- The sons of Count Siboto IV, Kuno and Siboto V (who heads the house on 1 January 1200 is not pinned)
- Title
- Counts of Falkenstein and Neuburg
- Since
- Not pinned
- Born
- Not pinned
- Family
- Siboto IV and his wife Hildegard of Mödling are shown with their sons Kuno and Siboto in the house's register of 1166, the Codex Falkensteinensis.
- Confidence
- low
de.wikipedia (Codex Falkensteinensis)
Overlord
The duke of Bavaria and the king; the duke of Austria for Hernstein.
What it holds
- Falkenstein castle above the Inn near Flintsbach
- Neuburg castle near Vagen on the Mangfall
- Hartmannsberg castle near the Chiemsee
- Hernstein in Lower Austria (Austrian ground; not drawn here)
- Lands in the Inn valley above Rosenheim and on the Grosse Vils
How it was acquired
Old comital house (not pinned).
Allies and rivals
Neighbours of the Wasserburg counts and of the bishop of Freising's Inn valley lands.
How things stand that morning
The house holds its castles; the head of the house that winter is not pinned.
Wealth
The Inn valley road into the Tyrol below Kufstein; farms and alpine pastures.
Military
Four castles and their ministeriales.
Places of note
- Falkenstein castle: Castle above the Inn.
- Neuburg castle: Castle near Vagen on the Mangfall, where the codex was written.
Where the sources disagree
Evidence: The codex of 1166 is the main evidence; the house in 1200 is not pinned.
On the map: Rough; the Vils valley lands are not drawn.
Primary sources for Bavaria
Chronicles, registers, sagas and inscriptions written in or near 1200 that cover this entry. Each has its own page with editions, translations and where to read it.
- Annals of Schäftlarn and the Bavarian annals (12th and 13th centuries). Brief Bavarian annals. Read online
- The Austrian and Salzburg annals (kept in the 12th and 13th centuries, with continuations to the late 13th century). A family of monastic annals from Austria, Styria and Salzburg, printed together. Read online
- Chronicle of Otto of St Blasien, Otto of St Blasien (about 1209 to 1210). A Swabian continuation of Otto of Freising written from the Staufen side. Read online
- Regesta Imperii V: calendar of the acts of Philip, Otto IV and Frederick II, 1198 to 1272 (calendar of documents of 1198 to 1272, published 1881 to 1901). A dated calendar of every known act of King Philip and King Otto IV, with the acts of popes and princes that bear on the Empire. Read online
- Bavarian monuments: the charters of the Bavarian monasteries and bishoprics (charters from the 8th century onward, published 1763 to 1916). The great charter series of Bavaria, arranged by monastery and bishopric. Read online
- Charter book of the bishops of Trent (compiled 1207 to 1218; documents from the 11th century onward; edited 1852). The cartulary of the prince-bishops of Trent. Read online
Sources and studies
Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.