Belgian lyric poet who founded the review La Jeune Belgique (Jeune Belgique, La) (1881–97; “Young Belgium”), the leading literary journal of its day.

Waller studied law at the Catholic University of Leuven (Louvain), where he worked on the student newspaper. With the founding of La Jeune Belgique, he began to publish the early work of most of the writers who later made a name for themselves in the Belgian literary renaissance (e.g., Maurice Maeterlinck (Maeterlinck, Maurice), Émile Verhaeren (Verhaeren, Émile), and Georges Rodenbach (Rodenbach, Georges)). Waller himself was sympathetic to the ideals of careful craftsmanship characteristic of the French Parnassian poets and was hostile to the free verse of the Symbolists (Symbolist movement). Nevertheless, he did much to make Belgian poets aware of all literary developments in Paris. His role as editor and supporter of other writers is the key to his place in Belgian literature; his own best work was criticism and polemics published in other journals. Waller died young and left just one important collection of verse, La Flute à Siebel (1887; “The Flute of Siebel”), made up of deft and clever little poems in the Parnassian style. Yet his poetry was closest in feeling to that of Heinrich Heine (Heine, Heinrich), Jules Laforgue (Laforgue, Jules), and Paul Verlaine (Verlaine, Paul).