diff --git a/src/calendar/temporal-feasts.ts b/src/calendar/temporal-feasts.ts
index 61043fc..670f37f 100644
--- a/src/calendar/temporal-feasts.ts
+++ b/src/calendar/temporal-feasts.ts
@@ -5,13 +5,14 @@
 // don't need a record at all (they're just collect-text lookups via
 // propers/index.ts's getTemporalProper); this only exists for the ones
 // that do.
-import type { OctaveConfig } from './types';
+import type { FeastClass, OctaveConfig } from './types';
 import { easterOffsetOf } from './temporal';
 
 export interface TemporalFeastRecord {
   id: string;
   name: string;
   octave?: OctaveConfig;
+  rank?: FeastClass;
 }
 
 const temporalFeastModules = import.meta.glob<{ default: TemporalFeastRecord }>(
diff --git a/src/data/calendar/temporal-feasts/christ-the-king.yml b/src/data/calendar/temporal-feasts/christ-the-king.yml
index f5fff5b..03af961 100644
--- a/src/data/calendar/temporal-feasts/christ-the-king.yml
+++ b/src/data/calendar/temporal-feasts/christ-the-king.yml
@@ -6,3 +6,4 @@
 # See calendar/index.ts's applyChristTheKing for the occurrence rule.
 id: christ-the-king
 name: "Christ the King"
+rank: duplex-1-classis
diff --git a/src/data/calendar/temporal-feasts/christmas-day.yml b/src/data/calendar/temporal-feasts/christmas-day.yml
index 9906e20..378e293 100644
--- a/src/data/calendar/temporal-feasts/christmas-day.yml
+++ b/src/data/calendar/temporal-feasts/christmas-day.yml
@@ -12,5 +12,6 @@
 # specifically.
 id: christmas-day
 name: "Christmas"
+rank: duplex-1-classis
 octave:
   enabled: true
diff --git a/src/data/calendar/temporal-feasts/marian-saturday.yml b/src/data/calendar/temporal-feasts/marian-saturday.yml
index 9b8b27d..452e161 100644
--- a/src/data/calendar/temporal-feasts/marian-saturday.yml
+++ b/src/data/calendar/temporal-feasts/marian-saturday.yml
@@ -5,3 +5,4 @@
 # for how a day actually becomes this.
 id: marian-saturday
 name: "Our Lady's Saturday"
+rank: simplex
diff --git a/src/data/calendar/temporal-feasts/pentecost-sunday.yml b/src/data/calendar/temporal-feasts/pentecost-sunday.yml
index 92ae45d..62dc34c 100644
--- a/src/data/calendar/temporal-feasts/pentecost-sunday.yml
+++ b/src/data/calendar/temporal-feasts/pentecost-sunday.yml
@@ -10,6 +10,7 @@
 # before it gets the chance.
 id: pentecost-sunday
 name: "Pentecost"
+rank: duplex-1-classis
 octave:
   enabled: true
   wins: duplex