YEMEN

The Republic of Yemen is a country in the south east of the Arabian peninsula. Its capital city is Sana'a . In 1918 the Ottoman empire pulled out of the north of the country and North Yemen became independent and in 1968 after an eight year civil war between the royalists and the republicans, the repubicans won and formed the north into the Yemen Arab Republic. At around the same time the Aden Emergency ended British rule in what was Aden and South Arabia which were joined together under a socialist government as the Peoples Democratic Republic of Yemen. In 1990, the two governments reached an agreement on joint governing and in May of that year the countries merged into the Republic of Yemen. Yemen is thought to be one of the oldest centres of civilisation in the middle east.

Monetary units:
1 rial = 40 Buqshas                  - north Yemen/ Arab republic
1 dinar = 1000 fils up to 1996   - south Yemen/ democratic republic

1 rial = 100 fils   from 1996      - Republic of Yemen

The first note above is the 1990 20 Rial note from the Yemen Arab Republic with a statue of cupid on  the front and a dhow with Sana'a in the background on the reverse or so the reference books say, however sana'a is inland and doesn't have a harbour so this i think may be the Aden Harbour (see below)
The next one above is again, from the Arab republic. this is a one Rial note from 1983 with the Baqiliyah Mosque on the front and coffee plants on the reverse.

This note above, is the 1 Dinar note from democratic republic of Yemen (south Yemen) . It is the 1965 issue with a dhow and Aden harbour in the background on the front and the reverse has a palm tree and a cotton tree branch.