Which English king invented a candle clock?

Alfred the Great back around 980 A.D.

Alfred the Great.

A candle clock was one of the first methods of measuring the passage of time. From ancient Asia to the Dark Ages of Britain, people found ways to use candles to tell time. Though no one knows who invented the first candle clock, there is no doubt that they have been in use for centuries. ... The most famous candle clock was invented by King Alfred the Great of England in 878. King Alfred created a device that utilized six candles. The candles were made from 72 pennyweights of wax and were each 12 inch tall and of equal thickness. Each candle had 12 one-inch markings which represented a block of time and burned away in four hours. The candles were placed in wooden cases with transparent horn panels. King Alfred used his candle clock to organize the time he spent on monarchy duties, prayer and study.

http://historicalresources.suite101.com/article.cfm/candle_clocks