Taizanji, more formally Taisan-ji, is temple 52 on the Shikoku 88 Temple Pilgrimage. It sits away from central Matsuyama, which means it feels more like a pilgrimage stop than an urban sightseeing item, with wooded approaches and the steady rhythm of white-clad henro passing through.
The temple is most rewarding if you are following part of the pilgrimage route or interested in how Matsuyama connects to the wider sacred geography of Shikoku. Even a short visit makes a useful counterpoint to Dogo Onsen and Matsuyama Castle: quieter, older in mood, and tied to movement on foot.