Allen-Morris marriage 1880's

[Di Allen]

Does anyone have any info about the marriage of William Allen[mygrandfather] to Agnes Morris[Hay Breconshire]. Their 1st child,Robert was born in1888 and they went on to have a further 5, Eliza Tudor, b.May 1891, Agnes, b.Nov 1893, Jack b.May 1895[my father], Bessie, b.1898 and Basil, b.Dec 1899. I can't find any information about their marriage and without info on William's father cannot move on with my family research. They lived in Cheapside, Birmingham in the 1891 and 1901 census. Thanks, Di.