List of Palmyrene monarchs
Al Fadl dynasty

Ruler
Reigned
Title
Notes
Sharaf ad-Din Issa
1281–1284
Prince
Appointed as a reward for aiding the Mamluks.
Husam ad-Din Muhanna
1284–1293
Prince
Imprisoned by the Mamluks.
Husam ad-Din Muhanna
1295–1312
Prince
Second reign.
Fadl ibn Isa
1312–1317
Prince
Brother of Muhanna.
Husam ad-Din Muhanna
1317–1320
Prince
Expelled with his tribe.
Husam ad-Din Muhanna
1330–1335
Prince
Fourth reign.
Muzaffar al-Din Musa
1335–1341
Prince
Son of Muhanna.
Suleiman I
1341–1342
Prince
Son of Muhanna.
Sharaf al-Din Issa
1342–1343
Prince
Son of Fadl bin Issa.
Saif
1343–1345
Prince
Son of Fadl bin Issa.
Ahmad
1345–1347
Prince
Son of Muhanna.
Saif
1347–1348
Prince
Second reign.
Ahmad
1348
Prince
Second reign.
Fayad
1348
Prince
Son of Muhanna.
Hayar
1348–1350
Prince
Son of Muhanna.
Fayad
1350–1361
Prince
Second reign.
Hayar
1361–1364
Prince
Second reign; rebelled and was dismissed.
Zamil
1364–1366
Prince
Son of Muhanna's brother Musa.
Hayar
1366–1368
Prince
Third reign; rebelled and was dismissed.
Zamil
1368
Prince
Second reign; rebelled and was dismissed.
Mu'ayqil
1368-1373
Prince
Son of Fadl bin Issa.
Hayar
1373–1375
Prince
Fourth reign.
Malik
1375–1379
Prince
Son of Muhanna.
Zamil
1379–1380
Prince
Third reign; ruled with Mu'ayqil.
Mu'ayqil
1379–1380
Prince
Second reign; ruled with Zamil.
Nu'air bin Hayar
1380–
Prince
Son of Hayar.
Musa
–1396
Prince
Son of Hayar's brother Assaf.
Suleiman II
1396–1398
Prince
Son of Hayar's brother 'Anqa.
Muhammad
1398–1399
Prince
Brother of Suleiman II.
Nu'air bin Hayar
1399–1406
Prince
Second reign.

Question: Who was the lord of Palmyra from 1284-1312 and 1317-1335?
Answer: Husam ad-Din Muhanna was the lord of Palmyra from 1284-1312 and 1317-1335.