diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/event/timeline/TimelineEvent.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/event/timeline/TimelineEvent.kt
new file mode 100644
index 00000000..781752fe
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/event/timeline/TimelineEvent.kt
@@ -0,0 +1,16 @@
+package dev.usbharu.hideout.core.domain.event.timeline
+
+import dev.usbharu.hideout.core.domain.model.timeline.Timeline
+import dev.usbharu.hideout.core.domain.shared.domainevent.DomainEvent
+import dev.usbharu.hideout.core.domain.shared.domainevent.DomainEventBody
+
+class TimelineEventFactory(private val timeline: Timeline) {
+    fun createEvent(timelineEvent: TimelineEvent): DomainEvent<TimelineEventBody> =
+        DomainEvent.create(timelineEvent.eventName, TimelineEventBody(timeline))
+}
+
+class TimelineEventBody(timeline: Timeline) : DomainEventBody(mapOf("timeline" to timeline))
+
+enum class TimelineEvent(val eventName: String) {
+    CHANGE_VISIBILITY("ChangeVisibility")
+}
\ No newline at end of file
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/Timeline.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/Timeline.kt
index 89c9e2f7..1a421254 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/Timeline.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/Timeline.kt
@@ -1,3 +1,30 @@
 package dev.usbharu.hideout.core.domain.model.timeline
 
-class Timeline(val id: TimelineId, val name: TimelineName, val visibility: TimelineVisibility, val isSystem: Boolean)
\ No newline at end of file
+import dev.usbharu.hideout.core.domain.event.timeline.TimelineEvent
+import dev.usbharu.hideout.core.domain.event.timeline.TimelineEventFactory
+import dev.usbharu.hideout.core.domain.model.userdetails.UserDetail
+import dev.usbharu.hideout.core.domain.model.userdetails.UserDetailId
+import dev.usbharu.hideout.core.domain.shared.domainevent.DomainEventStorable
+
+class Timeline(
+    val id: TimelineId,
+    val userDetailId: UserDetailId,
+    name: TimelineName,
+    visibility: TimelineVisibility,
+    val isSystem: Boolean
+) : DomainEventStorable() {
+    var visibility = visibility
+        private set
+
+    fun setVisibility(visibility: TimelineVisibility, userDetail: UserDetail) {
+        check(isSystem.not())
+        require(userDetailId == userDetail.id)
+        this.visibility = visibility
+        addDomainEvent(TimelineEventFactory(this).createEvent(TimelineEvent.CHANGE_VISIBILITY))
+    }
+
+    var name = name
+        private set
+
+
+}
\ No newline at end of file
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/TimelineId.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/TimelineId.kt
index 953eda15..c93738d8 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/TimelineId.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/TimelineId.kt
@@ -1,5 +1,4 @@
 package dev.usbharu.hideout.core.domain.model.timeline
 
-class TimelineId {
-
-}
+@JvmInline
+value class TimelineId(val value: Long)
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/TimelineName.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/TimelineName.kt
index 6d096c8d..a8dd2f87 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/TimelineName.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timeline/TimelineName.kt
@@ -1,5 +1,4 @@
 package dev.usbharu.hideout.core.domain.model.timeline
 
-class TimelineName {
-
-}
+@JvmInline
+value class TimelineName(val value: String)
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timelinebuilder/TimelineBuilderId.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timelinebuilder/TimelineBuilderId.kt
index 7312beb8..e54b4ab2 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timelinebuilder/TimelineBuilderId.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/timelinebuilder/TimelineBuilderId.kt
@@ -1,5 +1,4 @@
 package dev.usbharu.hideout.core.domain.model.timelinebuilder
 
-class TimelineBuilderId {
-
-}
+@JvmInline
+value class TimelineBuilderId(val value: Long)