The OP doesn't have a period restriction, so I think films like Dacii can be included as well.
As for Bulgarian movies, here are some that I know of:
-
Han Asparuh (aka "681 - Glory of the Khan" in its shortened American version) - a 1981 movie, made for the 1300 years jubilee and one of the most epic movies ever (ok, ok, after War and Peace and some other Soviet ones). A trilogy about the disintegration of the Old Great Bulgaria and the creation of the Danubian Bulgaria. A
playlist with some cut-scenes from the original movie,
playlist with parts of the shortened American version. Full movie, low quality:
1,
2,
3,
4,
5,
6.
-
Deniat na vladetelite (The day of the rulers) - a 1985 movie about Khan Krum's reign and his fights with the Byzantines.
Parts 1 and 2.
-
Konstantin Philosoph - a 1983 movie about the life of St. Constantine/Cyril, the creator of the Glagolithic alphabet, after whom our current Cyrillic alphabet is named
-
Boris I. Posledniat ezichnik (Boris I. The last heathen) - a 1984 movie about the reign of Kanas Boris I and his conversion to Christianity.
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13
-
Zlatniat Vek (The Golden Age) - a 1984 serial movie about the first Golden Age of Bulgaria under Tsar Simeon I. Episodes
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11.
-
Kaloyan - a 1962 movie about the reign of Tsar Kaloyan and his fights with the knights of the 4th Crusade.
1,
2,
3,
4.
-
Svatbite na Ioan Asen (The weddings of Ioan Asen) - a 1975 (somewhat artistic) movie about the reign of Tsar Ioan Asen II, famous, among other things, with the many weddings he organized and used in his diplomacy. The main actor who played the tsar, Apostol Karamitev, died during the making of the movie, so in some scenes he's replaced by the actor who plays his brother.
1,
2,
3,
4,
5,
6,
7,
8.
-
Boyanskiat maistor (The master-painter of Boyana) - a 1980 movie about the master-painter at the re-construction of the Boyana church, famous with its proto-renaissance style.
Parts 1 and 2.
-
Ivailo - a 1963 movie about the peasant tsar Ivailo and his fights with Mongols, Romans and Bulgarian royalists.
Parts 1 and 2.
-
Vreme na nasilie (Time of violence) - a 1987 movie, based on the great book of Anton Donchev "Vreme Razdelno" (Time of partition), about the forceful Islamization of the Rhodopes region in the 17th century.
Torrent with English subtitles edited by me. Online streaming on BG:
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12.
-
Zapiski po bulgarskite vustania (Notes on the Bulgarian uprisings) - a 1976 serial movie about the Bulgarian uprisings against the Ottomans, based on the historical memoirs of the revolutionary Zahari Stoyanov.
Playlist with 44 videos.
-
Ikonostasat (The iconostasis) - a 1968 movie, based on the book of Dimitar Talev "Zhelezniat svetilnik" (The iron lamp), about Macedonia in the beginning of the liberation movement (AFAIK, the movie's centred around a specific part of the book, concerning the iconostasis-maker).
Parts 1 and 2.
-
Pod igoto (Under the yoke) - a 1953 movie, based on the classical novel of Ivan Vazov, about the struggles of the Bulgarian people under the Ottoman rule and the consequent April Uprising in 1876.
Parts 1 and 2.
-
Geroite na Shipka (The heroes of Shipka) - a 1954 Soviet-Bulgarian production about the Russian-Turkish Liberation War from 1877-1878.
Parts 1 and 2.
-
Kapitan Petko Voivoda (Captain Petko Voivoda) - a 1981 serial movie about the Bulgarian revolutionary Petko Voivoda (12 episodes in
numerous parts)
-
Mera spored mera (Measure for measure) - a 1981 movie about the struggles of the Macedonian Bulgarians left under Turkish oppression and the consequent Ilinden-Preobrazhenie Uprising in 1903.
Playlist with 29 parts.
-
Tsar i general (Tsar and general) - a 1965 movie about the turbulent times during World War II.
Parts 1 and 2.
Loosely historical:
-
Hitar Petar (Clever Peter) - a 1960 movie based on the humorous tales about the clever folk hero.
1,
2,
3,
4
NOTE: All movies are on Bulgarian only. The only Bulgarian movies in the internet with foreign subs/dubs, as far as I know, are Vreme Razdelno (torrent link above), the shortened "
681 - Glory of the khan" (with bad English dubs and in-built BG subs) and "
Gentleman for a day".
Have fun watching!
Or, in general, you can check this
guy's collections ("Балканско кино" means "Balkan movies", "БГ филми" means "Bulgarian movies") for some other ones.
And, please, people,
don't embed videos - it creates a horrible lag on some older computers and nets. In the last two hours I've had at least a couple of micro-crashes, 3 browser crashes and a full system reboot, while browsing this page.
P.S. If we're talking also about non-feature films, here are some short CGI animations from the Operatsia Slava show:
Asparukh,
Tervel,
Krum (from 08:15 till the end, and till 00:20
here),
Simeon (from 01:25 till 03:35),
Kaloyan (from 02:40 till 05:20),
Ioan Asen II (from 09:10 till the end, and till 01:35
here).